Riesel primes of the form 75•2n-1

Reserved! This sequence is currently part of Multi Reservation 4: NPLB K300 Drive 2.

Current data

k , b : 75 , 2 Type : 315 Count : 65 Nash : 3181 Max n : 3,100,000 Date : 2025-03-12 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

1, 3, 5, 6, 18, 19, 20, 22, 28, 29, 39, 43, 49, 75, 85, 92, 111, 126, 136, 159, 162, 237, 349, 381, 767, 969, 1247, 1893, 1951, 2363, 2657, 3065, 3090, 3836, 4110, 4342, 5671, 6807, 21945, 24658, 30082, 31811, 54510, 70828, 79292, 80938, 84432, 92235, 113429, 170933, 182433, 196071, 199819, 231580, 306789, 424392, 434323, 631091, 814857, 995721, 2050637, 2130432, 2562382, 3006235, 3271125

History

• 2025-03-05: 3006235 confirmed, Gary Barnes, NPLB K300 Drive 2
• 2025-02-27: Reserved by NPLB K300 Drive 2 from n = 3000000
• 2024-09-03: Found n = 3271125, Serge Batalov
• 2024-08-30: Found n = 3006235, Serge Batalov
• 2024-05-07: Reservation dropped, William Byerly
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2017-07-27: Reserved by William Byerly
• 2013-10-01: none, Larry Soule, released
• 2011-10-26: Checked n = 2300000 - 3000000, Larry Soule
• 2011-09-03: Found n = 2562382, Larry Soule
• 2011-08-25: Checked n = 2000000 - 2300000, Larry Soule
• 2011-07-25: Found n = 2130432, Larry Soule
• 2011-07-18: Found n = 2050637, Larry Soule
• 2011-07-11: Checked n = 1800000 - 2000000, Larry Soule
• 2011-05-17: Checked n = 1659823 - 1800000, Larry Soule
• 2011-04-21: Reserved by Larry Soule from n = 1659823
• 2011-04-12: Checked n = 1160000 - 1350000, 1400000 - 1652100, Larry Soule
• 2011-03-15: Reserved by Larry Soule from n = 1160000
• 2010-12-04: Checked n = 1150000 - 1160000, Carlos Eduardo Pinho, released
• 2010-12-01: Reserved by Carlos Eduardo Pinho from n = 1150000
• 2010-11-28: none, Carlos Eduardo Pinho, released
• 2010-11-23: Reserved by Carlos Eduardo Pinho
• 2010-04-13: Checked n = 1045000 - 1090000?, 1130000 - 1150000, Predrag Minovic
• 2009-07-30: Reserved by Borys Jaworski for sieving only n = 1500000 - 5000000
• 2009-07-26: Checked n = 1090000 - 1130000, 1350000 - 1400000, (unknown), See ranges done at RPS other completed ranges.
• 2009-07-26: Checked to n = 1045000, Thomas Ritschel ?, See limit at above link.
• 2009-01-09: Checked n = 950000 - 979401, 1652060 - 1659823, Peter Benson
• 2008-01-29: Found n = 995721, Thomas Ritschel
• 2008-01-07: Checked n = 500000 - 850000, Thomas Ritschel
• 2008-01-07: 814857 confirmed, Thomas Ritschel
• 2007-11-28: Found n = 631091, Thomas Ritschel
• 2007-07-10: Found n = 814857, Peter Benson
• 2007-01-02: Reserved by Thomas Ritschel from n = 500000
• 2005-03-07: Checked n = 250000 - 500000, Thomas Ritschel, released
• 2005-03-07: Found n = 434323, Thomas Ritschel
• 2005-03-07: Found n = 424392, Thomas Ritschel
• 2005-03-07: Found n = 306789, Thomas Ritschel
• 2005-02-15: Reserved by Thomas Ritschel
• 2004-06-14: Checked n = 79000 - 250000, Patrick Keller
• 2004-06-12: Found n = 231580, Patrick Keller
• 2004-06-08: Found n = 199819, Patrick Keller
• 2004-06-07: Found n = 196071, Patrick Keller
• 2004-06-07: Found n = 182433, Patrick Keller
• 2004-06-06: Found n = 170933, Patrick Keller
• 2004-05-31: Checked to n = 79000, Patrick Keller
• 2004-05-30: Reserved by Patrick Keller
• 2003-12-22: Checked n = 1 - 10000, (15k stats page)
• 1994: Found n = 6807, Harvey Dubner
• 1989: Found n = 24658, Sergio Zarantonello, Joel Smith, Gene Smith, Bodo Parady, Landon Curt Noll, John Brown
• 1989: Found n = 21945, Sergio Zarantonello, Joel Smith, Gene Smith, Bodo Parady, Landon Curt Noll, John Brown