Riesel primes of the form 203•2n-1

Reserved! This sequence is currently part of Multi Reservation 7: NPLB K300 Drive 3.

Current data

k , b : 203 , 2 Count : 29 Nash : 1687 Max n : 3,000,000 Date : 2025-03-05 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 22, 82, 142, 190, 232, 314, 1682, 2302, 5598, 6632, 6720, 11080, 22094, 31310, 53088, 105890, 115350, 235480, 248862, 313474, 455190, 480918, 676032, 809848, 859602, 2222744, 2595752, 2935338

History

• 2025-03-05: Reserved by NPLB K300 Drive 3 from n = 3000000
• 2025-03-05: Checked n = 2200000 - 3000000, NPLB K300 Drive 1, released
• 2025-01-16: Found n = 2935338, Gary Barnes, NPLB K300 Drive 1
• 2024-08-23: Found n = 2595752, Florian Piesker, NPLB K300 Drive 1
• 2024-05-10: Found n = 2222744, Florian Piesker, NPLB K300 Drive 1
• 2024-05-05: Reserved by NPLB K300 Drive 1 from n = 2200000
• 2022-03-09: Checked to n = 2222000, RPS Megabit Drive 3
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2014-05-30: Reserved by RPS Megabit Drive 3 for n > 1400000
• 2011-02-01: Checked to n = 1400000, RPS Drive 6, released
• 2008-10-20: Found n = 859602, David Metcalfe, RPS Drive 6
• 2008-09-19: Found n = 809848, Even Stokkedalen, RPS Drive 6
• 2008-07-16: Found n = 676032, Carlos Eduardo Pinho, RPS Drive 6
• 2008-06-22: Reserved by RPS Drive 6, for n > 600000
• 2006-12-16: Checked to n = 600000, RPS Drive 4, released
• 2006-09-08: Found n = 480918, Thomas Ritschel, RPS Drive 4
• 2006-08-31: Found n = 455190, Predrag Minovic, RPS Drive 4
• 2006-08-07: Found n = 313474, Thomas Ritschel, RPS Drive 4
• 2006-07-28: Reserved by RPS Drive 4, for n = 260000 - 600000
• 2004?: Checked to n = 250000, Mark Anderson, released
• 2004-08-09: Found n = 248862, Mark Anderson
• 2004-08-05: Found n = 235480, Mark Anderson
• 2004-06-04: Reserved by Mark Anderson, for n ≤ 250000