Williams primes of the form 26•27n+1

Reserved! This sequence is currently reserved by: Mark Rodenkirch

Current data

Base : 27 Count : 21 Max n : 333,333 Date : 2024-08-19 Reserved : Mark RodenkirchMark Rodenkirch/Reserved

4, 5, 167, 408, 416, 701, 707, 1811, 3268, 3508, 7020, 7623, 16449, 35920, 55161, 77645, 87172, 129328, 134853, 217643, 478625

Remarks :

Do not add primes here. Only add primes 3*n to Proth 26•3n+1. For additional history, see above reused Proth sequence.

History

• 2024-08-19: Reserved by Mark Rodenkirch for n = 2 - 100000, double-check
• 2021-03-07: Checked n = 300000 - 333333, Paul Vanderveen, from Proth 26•3ⁿ+1
• 2020-05-24: Checked n = 25000 - 110000, Paul Vanderveen
• 2020-05-18: Reserved by Paul Vanderveen
• 2018-03-17: Checked n = 1 - 25000, Eric Chen
• 2016: Checked n = 1 - 1000, Mauro Fiorentini