George Woltman's PRP


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 reflects on the primes currently on the list. (Many of the terms that are used here are explained on another page.)

Proof-code(s): gb1, g53, g216, g230, g225 ... ... g423, g425, L4094, SB10, SB11
Active wild codes: ^SB\d$
E-mail address:
Web page:
Username PRP (entry created on 12/27/2002 17:27:00 UTC)
Database id:432 (entry last modified on 11/6/2016 21:56:19 UTC)
Program Does *: prp
Active primes:on current list: 29, rank by number 22
Total primes: number ever on any list: 3118
Production score: for current list 51 (normalized: 640), total 51.5160, rank by score 20
Largest prime: 19249 · 213018586 + 1 ‏(‎3918990 digits) via code SB10 on 5/7/2007 20:11:25 UTC
Most recent: 2297973 · 21677460 + 1 ‏(‎504973 digits) via code L4094 on 1/14/2021 05:50:32 UTC
Entrance Rank: mean 77.59 (minimum 4, maximum 445)

Descriptive Data: (report abuse)

The PRP (probable prime) program is designed to speed up the search for new primes in Yves Gallot's Proth prime project. This project began with Yves landmark proth.exe program several years ago. Over time the program grew to find Fermat factors and more types of primes. Paul Jobling later wrote NewPgen to speed up the sieving process. This new program takes the output of NewPgen and screens it for probable primes. The output of this program is then given to Yves' proth.exe for final primality proving.

To use PRP, first run NewPgen to create a file. Then, run PRP and select Test / Input Data. Specify the output file of NewPgen as the input file to PRP, also specify a new output file, and start at line 1. Finally, give the output file from PRP as the input file to Proth.exe. You can interrupt execution at any time, PRP will begin where it left off when you run it again.

Surname: PRP (used for alphabetizing and in codes).
Unverified primes are omitted from counts and lists until verification completed.
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