Proth primes of the form 28•3n+1

Reserved! This sequence is currently reserved by: Mark Rodenkirch

Current data

k , b : 28 , 3 Count : 15 Nash : 2394 Max n : 100,000 Date : 2024-08-19 Reserved : Mark RodenkirchMark Rodenkirch/Reserved

3, 4, 8, 11, 14, 15, 18, 495, 2475, 3538, 5188, 34870, 83394, 119016, 149671

Remarks :

See also Williams 28•27n+1

History

• 2024-08-19: Reserved by Mark Rodenkirch for n = 6 - 300000 only n ≡ 0 mod 3
• 2024-08-19: Reservation dropped, Paul Vanderveen
• 2021-03-08: Checked n = 1 - 100000, Paul Vanderveen
• 2021-03-08: Reserved by Paul Vanderveen
• 2005-03-27: Found n = 149671, Peter Benson
• 2004-03-27: Found n = 119016, Peter Benson