OpenPFGW (a.k.a. PrimeForm)
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
  View this page in:   language help
GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

program A titan, as defined by Samuel Yates, is anyone who has found a titanic prime. This page provides data on those that have found these primes. The data below only reflect on the primes currently on the list. (Many of the terms that are used here are explained on another page.)

Proof-code(s): c13, c23, c26, c31, c32 ... ... c87, x46, CH11, x45, g430
Active wild codes: ^p\d+
Code prefix:p
E-mail address: (e-mail address unpublished)
Web page:
Username: PrimeForm (entry created on 01/18/2000)
Database id:175 (entry last modified on 06/03/2019)
Program Does *: other, sieve, prp, special, plus, minus, classical
Active primes:on current list: 489, rank by number 7
Total primes: number ever on any list: 16733
Production score: for current list 51 (normalized: 992), total 51.3003, rank by score 19
Largest prime: 75898524288 + 1 ‏(‎2558647 digits) via code p334 on 11/19/2011
Most recent: (2334015439 - 1)/23339 ‏(‎67435 digits) via code p170 on 03/05/2020
Entrance Rank: mean 34945.70 (minimum 13, maximum 112157)

Descriptive Data: (report abuse)

"PrimeForm" (the former name of this program) allows probable prime tests of arbitrary expressions, and deterministic classical tests wherever possible. The current version, PrimeForm/GW, is available here for many x86 platforms, including Windows, Linux, and Mac. It uses the George Woltman libraries (gwnum), as developed for the GIMPS project, for high-speed PRP and classical testing of arbitrary forms. There are both 32-bit and 64-bit builds available. You will also find a WIndows GUI version of PFGW, called WinPFGW, that can run on Windows XP, Windows Vista, and Windows 7.

OpenPFGW is an open source project. The source code is freely available and all contributions are welcome. You can find discussions on pfgw capabilities and usage. You can find discussions on pfgw releases.

The previous version of the program, "PrimeForm for Windows", is now obsolete. It is a sister program to Yves Gallot's proth.exe and uses the same mathematics libraries as proth.exe. It is still available for users who prefer a GUI, but it is several times slower than pfgw.

Many thanks to George Woltman and Yves Gallot for providing their wonderful mathematics libraries for the respective program versions. Thanks to Chris Caldwell and Preda Mihailescu for optimizations of the classical tests, thanks also go to Chris for supporting the p?? prover codes in the top 5000 database. Above all, thanks and appreciation go to the numerous mathematicians and computer scientists whose methods are used by the program.

I administer OpenPFGW (a.k.a. PrimeForm) and I would like to
Edit this page
Surname: OpenPFGW (used for alphabetizing and in codes)
Unverified primes are omitted from counts and lists until verification completed.