Mark Rodenkirch's FactorialPrimorial Sieves


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): p290, p301, p302, p312, p346, p362, p381, p397, x46
E-mail address:
Web page:
Username: fpsieve (entry created on 10/05/10)
Database id:2474 (entry last modified on 10/24/18)
Program Does *: sieve
Active primes:on current list: 7, rank by number 25
Total primes: number ever on any list: 13
Production score: for current list 46 (normalized: 9), total 46.9560, rank by score 27
Largest prime: 147855! - 1 ‏(‎700177 digits) via code p362 on 09/01/13
Most recent: 513755!5 - 1 ‏(‎542165 digits) via code x46 on 05/26/19
Entrance Rank: mean 446.00 (minimum 130, maximum 1997)

Descriptive Data: (report abuse)

A collection of sieves to support factorial and primorial prime searches.

fsieve: a sieve program for factorial primes

psieve: a sieve program for primorial primes.

fpsieve: a program developed by Geoff Reynolds which combines the functions of both fsieve and psieve into a single executable. The main additional feature is multi-threading which makes it more convenient to use on multi-core machines and uses less memory.

fsievecl: a OpenCL sieve program for factorial primes

mfsieve: a sieve program for multi-ffactorial primes

Surname: Fpsieve (used for alphabetizing and in codes)
Unverified primes are omitted from counts and lists until verification completed.
I administer Mark Rodenkirch's FactorialPrimorial Sieves and I would like to
Edit this page
Printed from the PrimePages <> © Chris Caldwell.