Riesel primes of the form 131•2n-1

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

Current data

k , b : 131 , 2 Count : 23 Nash : 1065 Max n : 3,000,000 Date : 2025-03-05 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 14, 34, 38, 42, 78, 90, 178, 778, 974, 1878, 3718, 4050, 5466, 6478, 35662, 40046, 56346, 98626, 131026, 138658, 603738, 1283258

History

• 2025-03-05: Reserved by NPLB K300 Drive 3 from n = 3000000
• 2025-03-05: Checked n = 2300000 - 3000000, NPLB K300 Drive 1, released
• 2024-05-16: Reserved by NPLB K300 Drive 1 from n = 2300000
• 2022-04-10: Checked to n = 2300000, RPS Megabit Drive 2
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2019-08-18: Checked to n = 2200000, RPS Megabit Drive 2
• 2015-06-19: Reserved by RPS Megabit Drive 2 for n > 2000000
• 2014-04-20: Checked to n = 2000000, Michael Curtis, released
• 2014-03-07: Checked to n = 1750000, Michael Curtis
• 2013-12-07: Checked to n = 1600000, Michael Curtis
• 2013-09-04: Checked to n = 1570000, Michael Curtis
• 2013-06-11: Checked to n = 1510000, Michael Curtis
• 2011-12-04: Checked to n = 1400000, Michael Curtis
• 2011-06-02: Checked to n = 1180000, Michael Curtis, n=1230000-1400000 done
• 2011-05-21: Found n = 1283258, Michael Curtis
• 2010-10-28: Checked to n = 1100000, Michael Curtis
• 2010-01-12: none, Michael Curtis
• 2009-10-14: Checked to n = 1000000, Michael Curtis
• 2009-09-01: Checked to n = 888000, Michael Curtis
• 2009-02-13: Checked to n = 800000, Michael Curtis
• 2008-12-03: Checked to n = 735000, Michael Curtis
• 2008-07-14: Checked to n = 700000, Michael Curtis
• 2008-01-07: Reserved by Michael Curtis
• 2008-01-06: Checked to n = 640000, Borys Jaworski, released
• 2007-11-12: Found n = 603738, Borys Jaworski
• 2007-10-01: Reserved by Borys Jaworski
• 2006-08-13: Checked to n = 600000, RPS Drive 2, released
• 2006-03-17: Reserved by RPS Drive 2, for n = 210000 - 600000
• 2005-01-10: Checked n = 200000 - 210000, Steven Harvey, released
• 2004-05-26: Reserved by Mark Anderson for n ≤ 200000
• 2000-05-05: Found n = 56346, Tom Kuechler
• 1999-09-30: Found n = 40046, Tom Kuechler
• 1999-08-31: Found n = 35662, Tom Kuechler