Geoffrey Reynolds' gcwsieve


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.)

L436, L447, L521, p234, p237 ... ... L4976, L5402, L5765, A6, A20
E-mail address:
Web page:
Username gcwsieve (entry created on 8/8/2007 22:41:11 UTC)
Database id:1223 (entry last modified on 2/3/2024 17:01:40 UTC)
Program Does *: sieve
Active primes:on current list: 58, rank by number 15
Total primes: number ever on any list: 149
Production score: for current list 53 (normalized: 7152), total 53.8821, rank by score 13
Largest prime: 8508301 · 217016603 - 1 ‏(‎5122515 digits) via code L4784 on 3/22/2018 10:20:51 UTC
Most recent: 4788920 · 39577840 - 1 ‏(‎4569798 digits) via code A20 on 2/14/2024 17:00:06 UTC
Entrance Rank: mean 522.36 (minimum 13, maximum 4033)

Descriptive Data: (report abuse)

A sieve for generalised Cullen/Woodall numbers n*b^n+/-1, where n < 2^32, b < 2^32. This sieve requires an existing ABC file (as produced by MultiSieve) with all factors smaller than the greatest exponent n already removed. The algorithm is based on an idea of Harsh Aggarwal, implemented with the help of Mark Rodenkirch.

Surname: Gcwsieve (used for alphabetizing and in codes).
Unverified primes are omitted from counts and lists until verification completed.
I administer Geoffrey Reynolds' gcwsieve and I would like to
Edit this page
Printed from the PrimePages <> © Reginald McLean.