Riesel primes of the form 103•2n-1

Reserved! This sequence is currently reserved by: Carlos Eduardo Pinho

Current data

k , b : 103 , 2 Count : 38 Nash : 1373 Max n : 3,100,000 Date : 2025-07-13 Reserved : Carlos Eduardo PinhoCarlos Eduardo Pinho/Reserved

3, 7, 11, 19, 63, 75, 95, 127, 155, 163, 171, 283, 563, 1739, 2243, 3971, 4375, 5227, 8307, 9943, 18383, 19835, 25879, 26927, 36895, 304771, 422939, 602483, 686251, 977951, 984667, 1077739, 1192775, 1486695, 1562619, 1860103, 2232551, 2462567

History

• 2025-07-13: Reserved by Carlos Eduardo Pinho from n = 3100000
• 2024-04-18: Checked n = 2550000 - 2550223, Gary Barnes, 6 tests
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2020-11-12: Checked n = 3000000 - 3100000, RPS Megabit Drive 1
• 2018-04-11: Checked n = 2550223 - 3000000, RPS Megabit Drive 1
• 2014-08-12: Reserved by RPS Megabit Drive 1 from n = 2550223
• 2014-08-12: Checked to n = 2550000, Thomas Ritschel, released
• 2014-08-03: Found n = 2462567, Thomas Ritschel
• 2014-02-28: Checked n = 2250000 - 2350000, Thomas Ritschel
• 2013-10-01: Checked n = 2100000 - 2250000, Thomas Ritschel
• 2013-05-09: Found n = 2232551, Thomas Ritschel
• 2013-04-23: Checked n = 2000000 - 2100000, Thomas Ritschel
• 2012-12-28: Checked n = 1300000 - 2000000, Thomas Ritschel
• 2012-12-24: Found n = 1860103, Thomas Ritschel
• 2012-11-14: Found n = 1562619, Thomas Ritschel
• 2012-11-03: Found n = 1486695, Thomas Ritschel
• 2012-10-30: Checked n = 1100000 - 1300000, Thomas Ritschel
• 2012-10-11: Found n = 1192775, Thomas Ritschel
• 2012-10-09: Reserved by Thomas Ritschel
• 2012-10-09: none, Adam Sutton, released
• 2009-06-10: Checked n = 985000 - 1100000, Adam Sutton
• 2009-06-06: Found n = 1077739, Adam Sutton
• 2009-05-19: Checked n = 684000 - 985000, Adam Sutton
• 2009-05-17: Found n = 984667, Adam Sutton
• 2009-05-16: Found n = 977951, Adam Sutton
• 2008-03-01: Found n = 686251, Adam Sutton
• 2008-02-29: Checked n = 500000 - 684000, Adam Sutton
• 2008-01-11: Found n = 602483, Adam Sutton
• 2007-12-15: Reserved by Adam Sutton
• 2006-11-03: Checked n = 491000 - 500000, Steven Tjung, released
• 2006-10-04: Checked n = 475000 - 491000, Steven Tjung
• 2006-09-05: Checked n = 445000 - 475000, Steven Tjung
• 2006-08-09: Checked n = 356000 - 445000, Michael Curtis
• 2006-08-01: Found n = 422939, Steven Tjung
• 2006-06-30: Checked n = 200000 - 356000, Steven Tjung
• 2006-04-26: Reserved by Steven Tjung to n = 500000
• 2004-08-30: Checked n = 20000 - 200000, (Marc) ?, see Riesellist 2004-08-30
• 2004-06-18: Reserved by (Marc)
• 2004-06-07: Checked n = 1 - 20000, (?), see Riesellist 2004-06-07
• 2003-10-08: Found n = 304771, Raffi Chaglassian
• 1999-10-11: Found n = 36895, Tom Kuechler
• 1989: Found n = 9943, Sergio Zarantonello, Joel Smith, Gene Smith, Bodo Parady, Landon Curt Noll, John Brown