Riesel primes of the form 227•2n-1

Reserved! This sequence is currently part of Multi Reservation 7: NPLB K300 Drive 1.

Current data

k , b : 227 , 2 Count : 32 Nash : 2550 Max n : 2,800,000 Date : 2024-11-13 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 4, 8, 12, 14, 26, 32, 80, 124, 230, 284, 562, 866, 1830, 2630, 3122, 3428, 6278, 9900, 19888, 20092, 22706, 29088, 31412, 44402, 47914, 53120, 102330, 135164, 299306, 345918, 1170724

History

• 2024-05-05: Reserved by NPLB K300 Drive 1 for 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
• 2010-12-06: Checked to n = 1400000, David Metcalfe, released
• 2010-08-01: Checked to n = 1300000, David Metcalfe
• 2010-06-30: Checked to n = 1250000, David Metcalfe
• 2010-05-31: Found n = 1170724, David Metcalfe
• 2010-04-30: Checked to n = 1150000, David Metcalfe
• 2009-03-14: Checked to n = 1150000, David Metcalfe
• 2008-10-22: Checked to n = 1000000, NPLB Drive 4, released
• 2008-10-21: Checked to n = 1000000, David Metcalfe
• 2008-09-11: Reserved by David Metcalfe
• 2008-09-09: Reserved by NPLB Drive 4
• 2006-08-13: Checked to n = 600000, RPS Drive 2, released
• 2006-04-14: Found n = 345918, Larry Soule, RPS Drive 2
• 2006-04-03: Found n = 299306, David Metcalfe, RPS Drive 2
• 2006-03-17: Reserved by RPS Drive 2, for n = 210000 - 600000
• 2004-12-24: Checked n = 200000 - 210000, Steven Harvey
• 2000-05-05: Found n = 44402, Phil Carmody