Oct. 21, 2024 -- Congrats to GIMPS and Luke Durant for the new discovery of the largest known prime 2136279841 - 1 !!!
Sep. 11, 2024 -- From the "Ruminations" page, Primitive with the most discovered factors (15) is 1900115 + 1. Which are ( 461 691 28751 4391851 266462591 284041951 1258377611 18499083541 112847450701 40006842753401 395457880739560921 21611354353640438553010181 179834267054185644381863231 3565653347381249739560354935017931 1920947690311774791216121401913175703203698776331 ). Apparently the last factor was found in December 2021.
June 26, 2024 -- Exponent 32 completed for bases < 20000. New lowest exponent is 34.
June 19, 2024 -- Fixed a bug where factor submit kowtow was hanging if remaining prime ultimate factor was apprx > 250 digits and < 500 digits.
June 8, 2024 -- Time to pick a name for the website. Also, the serious job of branding and setting the tone.
May 17, 2024 -- Exponent 27 completed for bases < 100000. New lowest exponent is 28.
Apr. 7, 2024 -- Added more cyclotomic info to the COWLIB browser.
Mar. 30, 2024 -- Added direct entry of factors to the COWLIB browser.
Mar. 22, 2024 -- Alrighty, got the composites/unknowns working for the LMs as well.
Mar. 21, 2024 -- Browser now shows the remaining composite/unknown for non-LMs (less than 5000 digits). (LMs should be done next.)
Mar. 20, 2024 -- Oops, there was a bug with the last addition. Should be ok now.
Mar. 16, 2024 -- Interactive browser, + and - buttons now show the cyclotomic primitive.
Mar. 7, 2024 -- All composites <= 127 digits now cleared out (BMtR). Mooving on to the 128 digit level.
Jan. 15, 2024 -- Lowest exponent for bases < 100000 is completed. New bottom exponent is 27.
Jan. 11, 2024 -- COWLIB browser, base info, now shows calculations on where Aurifeuillian factorizations will occur.
Dec. 24, 2023 -- Some features have been added to the browser under the "Interactive" tab. Clicking on an entry cell will show known primitive factors, tlevel completed, date the composite/unknown was last updated, and date the tlevel was last updated. Clicking on a base column header will show the contiguous range of exponents starting at exponent 1. Clicking on an exponent row header will show the contiguous range of bases starting at base 2. Happy Holidays!
Nov. 7, 2023 -- Added a new tab "Interactive" which currently only has a basic browser of the db.
Oct. 9, 2023 -- Lowest exponent for bases < 1000 is now finished. New exponent is now 71.
Sep. 10, 2023 -- Because why not, added a Nikola Tesla list of composites (had to break it up into 9 subsets, though).
Aug. 26, 2023 -- 126 digits level and below cleared out. New bottom level is 127 digits.
June 28, 2023 -- 125 digits level and below cleared out. New bottom level is 126 digits.
May 9, 2023 -- Lowest exponent for bases < 20000 finished. New lowest exponent is 32.
Mar. 28, 2023 -- Lowest exponent for bases <= 999 finally finished (which was exponent 67). New lowest exponent is now 68. (Thanks Rocke for already starting to clear this exponent out.)
Mar. 3, 2023 -- Added "Hindsight" numbers. Looking back, clearly could of added them like 3 years earlier, but everything is easier looking backwards as they say.
Jan. 28, 2023 -- 124 digits level completed and all DREGs cleared out. New bottom level is 125 digits.
Jan. 22, 2023 -- Removed html line breaks from the "LCD_2_199" and "LCD_2_998" files. (Also, playing around with layouts on the web pages. Let me know if anything breaks.)
Jan. 3, 2023 -- For "Factorizations -- Raw Table Data (Primitive Factors Only)" report, stop showing the empty entries (difference of squares) and also expand numbers if less than 51 digits.
Jan. 2, 2023 -- New calculator that calculates group order from ECM factor, parameterization, and sigma.
Dec. 26, 2022 -- Added option of Separate LM entries to "Factorizations -- Raw Table Data (Primitive Factors Only)" report.
Dec. 20, 2022 -- 123 digits level and below completed. 124 digits is the new bottom level.
Oct. 26, 2022 -- 122 digits level completed. 123 digits is the new bottom level.
Oct. 13, 2022 -- Sped up cyclo.cpp and cyclop.cpp which are used for computing LMs and LM primitives.
Sep. 7, 2022 -- Exponent 29 finished for base < 20000. New exponent level is 31.
Sep. 4, 2022 -- 121 digits level completed. 122 digits is the new bottom level.
Aug. 10, 2022 -- 120 digits level completed. 121 digits is the new bottom level.
Aug. 8, 2022, Part II -- Decided to not abandon the First Holes report. Now it will show different ranges based on a selection of Custom Sets.
Aug. 8, 2022 -- The smaller BMteR set has been completed. (Congratulations to all the factorers!!!) Removed the references, but you can still access the set with the custom set: (Level: an <= 255 digits) and (Base Range: 13 to 99).
July 5, 2022 -- 119 digits level and below finished. DREGs now defined as 1 - 119 digits.
June 26, 2022 -- Added tlevel counts to the headers of composite reports under "Lists" tab.
May 21, 2022 -- 118 digits level finished. DREGs to be defined as 1 - 118 digits now.
May 12, 2022 -- Did the same for Factorizations -- Custom Sets.
May 7, 2022 -- Separated out the an size type composite list reports. Also added a new layer for (256 digits <= an <= 300 digits).
Apr. 5, 2022 -- New report "Factorizations -- Raw Table Data (Primitive Factors Only)" added. Pretty self-explanatory.
Feb. 1, 2022 -- Exponent 25 finished for base < 100000. Next exponent level is 26.
Jan. 28, 2022 -- Exponent 28 finished for base < 20000. Next exponent level is 29.
Jan. 20, 2022 -- The 117 digits level is finished plus all the DREGs underneath. New bottom level is now 118 digits.
Dec. 8, 2021 -- Added a new report (Factorizations -- Custom Sets).
Sep. 15, 2021 -- Exponent 23 is finished (for bases 2 to 99999). Moving on to exponent 25.
Jul. 22, 2021 -- Finally finished the 116 digit level ( actually most of the work was from clearing out new smaller composites ). New bottom level is 117 digits.
Jul. 8, 2021 -- (Update on 536499 + 1). So, the remaining c158 had a t35 applied, then t40, t45, and then halfway through the t50 a p47 factor reduced the composite down to a c111. Applying gnfs to the c111 splits it into a p52 * p60. The end.
Jul. 5, 2021 -- Nice Step 1 ecm factor. 536499 + 1 = ... * 24206656626581177768380877846141983650196328238889819635934725310680713245985883910974547729744753005919830204981896148705826344915049257201135702770624474910147150020553185997399173148895168659266850793 which has a 45 digit factor 495950925050630992726886401357281639246762229. Factordb reports group order to be "2^5 · 3^2 · 83 · 89 · 103 · 173 · 277 · 443 · 17837 · 33461 · 59069 · 108347 · 121403 · 229903". (Sigma was "0:11179499293564437648").
Apr. 29, 2021 -- Nice surprise on pi day. 274355 + 1 = ... * 66760963308159485607970064442420550002778142721613861 * 66835976028006408038993090992382147578474788224694871. (99.8% equal.)
Feb. 10, 2021 -- First baby steps towards making this site multi-page. Let me know if there are issues.
Dec. 29, 2020 -- Add same search functionality to bulk Factor Submission.
Dec. 28, 2020 -- On Submit Factor in Single Factorization query, search all primitives of algebraic factors and add factor to the appropriate one.
Dec. 27, 2020 Part III -- For Factorizations query, show entries where bases are perfect powers.
Dec. 27, 2020 Part II -- Boost max entries in Factorizations Query from 2000 to 20000.
Dec. 27, 2020 -- Added a "Refresh" button to Single Factorization query. Also, added a "Go Back" button to Submit Factor output.
Dec. 22, 2020 -- Added automatic convert of perfect bases in Single Factorization query. Also, added a "Go Back" button and fixed a bug where only one factor could be added at a time.
Nov. 16, 2020 -- The 115 digits level is finished plus all digits below (ie. the DREGs). New ground level is 116 digits. Also, digit levels now extend up to 500 digits (was 134 digits). And also, updates are now instantly/automatically reflected in the digit level lists. (Yay partial indexes!)
Sep. 26, 2020 -- Adding a new collection of composite sets based on number of digits. Will initially run from 115 digits to 134 digits. Just for fun, composites with less than 115 digits will be called "DREG"s which stands for "Digits Reduced by Ecm to less than Ground level".
Aug. 19, 2020 -- The 114 digits list is finished. Moving on to 115 digits.
Jun. 5, 2020 -- The 113 digits list is finished. Moving on to 114 digits.
Mar. 28, 2020 -- Added label selector to Odd-Perfect Style and Regular composite lists.
Mar. 24, 2020 -- The 112 digits list is finished. Moving on to 113 digits.
Mar. 18, 2020 -- Expanded Skew Optimizer to handle octic polynomials.
Feb. 29, 2020 -- The 111 digits list is finished. Moving on to 112 digits.
Feb. 20, 2020 -- Added a shuffled option and a Max Count to Composites Search.
Feb. 12, 2020 -- Added a Quick Composite Search.
Feb. 11, 2020 -- Added t-level filtering to composites search.
Feb. 10, 2020 -- Added filtering for L and M composite types.
Jan. 1, 2020 -- Happy New Year!
Dec. 26, 2019 -- The 110 digits list is finished. Moving on to 111 digits.
Nov. 18, 2019 -- Added Cunningham Project composites list. For the definitive lists visit the official website.
Nov. 13, 2019 -- The 109 digits list is finished. Moving on to 110 digits.
Oct. 26, 2019 -- The 108 digits list is finished. Moving on to 109 digits.
Oct. 9, 2019 -- The 107 digits list is finished. Moving on to 108 digits.
Sep. 26, 2019 -- The 106 digits list is finished. Moving on to 107 digits.
Sep. 18, 2019 -- The 105 digits list is finished. Moving on to 106 digits.
Sep. 6, 2019 -- The 104 digits list is finished. Moving on to 105 digits.
Sep. 5, 2019 -- Lowest exponent for bases up to 9999 finished. New exponent is 43.
Aug. 22, 2019 -- Smallest composites list updated to 104 digits. (Wow, that one went fast.)
Aug. 11, 2019 -- Smallest composites list updated to 103 digits.
July 10, 2019 -- Smallest composites list updated to 102 digits.
May 16, 2019 -- Extended bases 11 to 99 to exponent 100000.
May 13, 2019 -- Extended bases 5 to 7 to exponent 400000.
May 4, 2019 -- Nice...So, thanks largely to outside help the list of smallest composites has gone down to zero entries. To keep things interesting the max number of digits is now boosted to 101.
Apr. 22, 2019 -- Added option to show composites/unknowns as an expression. Renders the gmp-ecm hint hack moot -- therefore deleting it.
Apr. 15, 2019 -- Smarter limits for Algebraic Factors explorer.
Apr. 10, 2019 -- Extended base 3 to exponent 600000.
Apr. 8, 2019 -- Change Composites list to Composites/Unknowns list.
Apr. 7, 2019 -- Lowest exponent (which was 26) for up to base 19999 completed. New lowest exponent is now 28.
Apr. 6, 2019 -- Nice. Just imported ~110K factors from the Wagstaff numbers project.
Apr. 4, 2019 -- Added options to print composites in Wagstaff and gmp-ecm hint hack formats.
Mar. 23, 2019 -- Base 10 expanded to exponent 300000.
Mar. 22, 2019 -- Base 2 expanded to exponent 2000000.
Mar. 21, 2019 -- Base expanded to 1100000.
Feb. 25, 2019 -- Thanks for the factors whoever you are!
Jan. 1, 2019 -- Happy New Year!
Dec. 9, 2018 -- Sync'd the other way (to Factordb) for the lowest exponent (currently 41) for bases 2 to 9999. Should be easier from now on as just have to worry about new factors after today.
Nov. 7, 2018 -- Oops. comps3 was missing 84 entries from before base 2000 due to a higher level of ecm effort and some bad assumptions :-(.
July 5, 2018 -- Lowest exponent (which was 22) for up to base 99999 completed. New lowest exponent is 23.
June 18, 2018 -- New utility added for showing algebraic factors.
June 10, 2018 -- Lowest exponent (which was 40) for up to base 9999 completed. Newest lowest exponent is 41.
June 3, 2018 -- Lowest exponent (which was 38) for up to base 9999 completed. New lowest exponent is 40.
May 28, 2018 -- So I've switched over to developing all Linux stuff using Ubuntu bash under Windows for the last 2 years. This is waaaay more convenient if you're just dealing with non-gui stuff. Here is a guide from Scott Hanselman.
May 23, 2018 -- Nice practical guide on how to factor numbers by Victor de Hollander can be found on mersenneforum here.
Apr. 17, 2018 -- Lowest exponent (which was 19) for up to base 99999 completed. New lowest exponent is 22.
Apr. 7, 2018 -- Lowest exponent (which was 23) for up to base 19999 completed. New lowest exponent is 26.
Apr. 5, 2018 -- Odd-Perfect Style Composite lists ecm'ed to t25 level.
Jan. 9, 2018 -- Due to popular demand (of a singular nature) Odd Perfect Style composite lists are now added. Cheers.
Jan. 1, 2018 -- Happy New Year! So, comps3 (exponent 37) finished. Mooving on (get it?) to exponent 38 for same base range 2 to 9999. All comps ecm'ed to the t35 level at least. Cheers.
Dec. 10, 2017 Part III -- Added a shuffled snapshot option to comps2 and comps3.
Dec. 10, 2017 Part II -- Added comps3 file. This will be the lowest unfinished exponent in the base range 2 to 9999. Composites ecm'ed to t30 level.
Dec. 10, 2017 -- Added comps2 file. This will be the lowest unfinished exponent in the base range 2 to 999. Composites ecm'ed to t40 level.
Oct. 14, 2017 -- Added an expanded LucasCD file which goes from base 2 to base 998.
Aug. 30, 2017 Part II -- Fixed extents for bases and exponents were out of date. Base 8675309 added.
Aug. 30, 2017 -- Fixed phone number format recognition being detected for entries in First Holes and Factorizations.
April 10, 2017 -- Received a report that the "mooo" domain name was not accessible from a certain ISP. Therefore, I'm adding the alternate url "myfactors.cownoise.com". Cheers.
June 30, 2016 -- Removed the pari dependencies from the source files for the Aurifeuillian LMs and Primitive(s) calculators. (By the way, they compile quite easily on linux bash shell for Windows 10 now.
June 9, 2016 -- Tweaked the Lucas CD output (now more human-readable).
May 20, 2016 -- Fiddled with the composites report.
May 18, 2015 -- Modified the SNFS poly generator to output coefficients of 0. Apparently, a newer version of perl causes factMsieve.pl to break. This is a workaround.
Feb. 7, 2014 -- Yay! We broke through the 300 composites level for the Brent composites! Keep them coming! Unfortunately for myself, my reservation is a slow go. Maybe another 2 months.
Jan. 1, 2014 -- Happy New Year to everyone!!!!
Oct. 8, 2013 -- Added degree 6 polynomials for exponents divisible by 3 to the .poly maker. Thanks to Viswam Raman's SNFS polynomial generator.
July 1, 2013 -- Updated the "cyclo.cpp" and "cyclop.cpp" source files for a speed improvement.
May 3, 2013 -- The .poly maker will now compute a value for n if none is given and there is no table entry. Also, small factors less than 8 digits in size will be divided out.
Apr. 30, 2013 -- A few minor updates. Ecm tlevel has been added to the composites query. Full factorizations and composites can now be filtered on prime exponents. Optimal skew calculator is now more accurate and shows nearby skews and MurphyE values. The .poly Maker now shows only one .poly by default with an option to show all candidates. (Still needs more work on how to pick the best .poly between different degrees.)
Mar. 21, 2013 -- Sharp eyes may notice that one factor disappeared from factors.gz this time. This was due to a factor (from 378566 + 1) later determined to be an ultimate (ie. largest factor from the primitive portion) factor which is not supposed to be included.
Mar. 3, 2013 -- Finally got around to implementing the extra polynomials for composite bases in the SNFS Polynomial Generator. Still needs LM's and a lot of tweaking.
Feb. 17, 2013 -- Apparently, there is a bug with the MurphyE's on the older msieve libraries. Now linking with svn 839 of the msieve library and noticing the MurphyE's have changed downwards.
Feb. 13, 2013 -- Added a little utility for optimizing the skew (for maximum MurphyE). Thanks to msieve library!
Feb. 10, 2013 -- Added the SNFS Polynomial Generator. Still needs functionality for composite bases and LM's.
Jan. 26, 2013 -- A big thanks to William Lipp of the Odd Perfect Number Search project. (24171 new factors).
Jan. 23, 2013 -- Adding a filtered list of factors -- "opfactors.gz" -- for data exchange with the oddperfect project.
Jan. 19, 2013 -- The first holes report is finished. Time to work on something more interesting like an SNFS polynomial generator. It's partially completed, so apprx. one week to finish.
Jan. 14, 2013 -- The new comps report is finished. (I suppose the proper terminology is "snapshot", not "live"). Next project is to revisit the "holes.txt" and make it more closely resemble the original.
Jan. 11, 2013 Part II -- A big thanks to Rocke Verser for sharing his private factor collection! 3818 new factors were added including 3 from the "comps" file and quite a few large factors as well!
Jan. 11, 2013 -- comps.gz is produced. The new count is 454 which is a reduction of 219 entries from the May 5, 2011 list or apprx. a 1/3 reduction in size. The next short step for the website will be making the comps list live.
Jan. 9, 2013 -- Ok, the last factors from Prof. Brent arrived yesterday. They are now assimilated into the db. factors.gz is also updated and I've added a delta.gz which is just the new factors since the last update. Next job will be producing the comps.gz file. It shouldn't be too big a job.
Jan. 7, 2013 -- I've agreed to maintain Prof. Richard Brent's "comps.gz", "factors.gz", and "holes.txt" files. Well, at least until "comps.gz" has been completed. For "comps.gz", I'm going to have to do a little coding, since I don't have a report exactly like that yet. That'll take a couple days. Also, I'll need the latest factors from Prof. Brent. For "factors.gz", I've got a report already set up and I'll put it on the website right away. For "holes.txt" my plan is to modify the "First Holes" report to use the "GET" method instead of the "POST" method. This will enable an http link to suffice for showing the first holes.