Riesel primes of the form 235•2n-1

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

Current data

k , b : 235 , 2 Count : 27 Nash : 1563 Max n : 2,800,000 Date : 2024-11-13 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

3, 9, 15, 75, 143, 425, 693, 803, 903, 953, 1079, 1613, 1667, 2937, 7157, 7899, 136767, 178739, 191973, 231927, 312345, 315773, 556077, 1718787, 1824515, 2163273, 2227565

History

• 2024-05-11: Found n = 2227565, Florian Piesker, NPLB K300 Drive 1
• 2024-05-05: Reserved by NPLB K300 Drive 1 for n > 2200000
• 2022-03-09: Checked to n = 2222000, RPS Megabit Drive 3
• 2021-04-23: Found n = 2163273, Gary Barnes, RPS Megabit Drive 3
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2014-07-06: Found n = 1824515, Serge Batalov, RPS Megabit Drive 3
• 2014-06-04: Found n = 1718787, Serge Batalov, RPS Megabit Drive 3
• 2014-05-30: Reserved by RPS Megabit Drive 3 for n > 1400000
• 2011-02-01: Checked to n = 1400000, RPS Drive 6, released
• 2008-06-22: Reserved by RPS Drive 6, for n > 600000
• 2006-08-13: Checked to n = 600000, RPS Drive 2, released
• 2006-07-05: Found n = 556077, Thomas Ritschel, RPS Drive 2
• 2006-04-08: Found n = 315773, David Metcalfe, RPS Drive 2
• 2006-04-07: Found n = 312345, Alexandre de Pereyra, RPS Drive 2
• 2006-03-21: 231927 confirmed, Larry Soule, RPS Drive 2
• 2006-03-17: Reserved by RPS Drive 2, for n = 210000 - 600000
• 2005-11-19: Found n = 231927, Jun Tajima
• 2005-01-10: Checked to n = 210000, Steven Harvey, released
• 2004-08-22: Checked to n = 200000, Ingmar Goudt
• 2004-08-21: Found n = 191973, Ingmar Goudt
• 2004-08-21: Found n = 178739, Ingmar Goudt
• 2004-08-20: Checked to n = 180000, Ingmar Goudt
• 2004-08-17: Checked to n = 150000, Ingmar Goudt
• 2004-08-16: Reserved by Ingmar Goudt