Riesel primes of the form 281•2n-1

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

Current data

k , b : 281 , 2 Type : Low Count : 18 Nash : 937 Max n : 2,700,000 Date : 2024-10-04 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

2, 38, 62, 82, 598, 890, 1810, 2242, 2450, 17786, 51470, 65558, 91870, 93850, 628898, 1009502, 1453426, 1860862

History

• 2024-04-23: Reserved by NPLB K300 Drive 1 for n > 2000000
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2015-03-24: Checked to n = 2000000, Thomas Ritschel, released
• 2015-02-19: Found n = 1860862, Thomas Ritschel
• 2015-02-13: Reserved by Thomas Ritschel for 1660000 < n < 2000000
• 2012-10-21: Checked to n = 1660000, Oscar Tutusaus Santandreu, released
• 2012-08-14: Checked to n = 1620000, Oscar Tutusaus Santandreu
• 2012-07-14: Checked to n = 1560000, Oscar Tutusaus Santandreu
• 2012-06-06: Checked to n = 1470000, Oscar Tutusaus Santandreu
• 2012-06-03: Found n = 1453426, Oscar Tutusaus Santandreu
• 2012-05-10: Reserved by Oscar Tutusaus Santandreu for n >= 1405000
• 2011-04-08: Checked to n = 1405000, Michael Curtis, released
• 2011-02-06: Checked to n = 1180000, Michael Curtis
• 2010-10-28: Checked to n = 1120000, Michael Curtis
• 2010-04-01: Found n = 1009502, Michael Curtis
• 2010-01-12: Checked to n = 1000000, Michael Curtis
• 2009-10-14: Checked to n = 945000, Michael Curtis
• 2009-09-01: none, Michael Curtis
• 2009-03-13: Checked to n = 900000, 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
• 2007-12-26: Found n = 628898, Borys Jaworski
• 2007-10-01: Reserved by Borys Jaworski
• 2006-12-16: Checked to n = 600000, RPS Drive 4, released
• 2006-07-28: Reserved by RPS Drive 4, for n = 260000 - 600000
• 2000-11-20: Found n = 65558, Tom Kuechler
• 2000-10-23: Found n = 51470, Tom Kuechler