Riesel primes of the form 219•2n-1

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

Current data

k , b : 219 , 2 Type : 3 Count : 18 Nash : 1069 Max n : 3,000,000 Date : 2025-03-05 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

7, 81, 381, 412, 657, 853, 1317, 3261, 3768, 6081, 14017, 19993, 25863, 31801, 40113, 48877, 558313, 2178673

History

• 2025-03-05: Reserved by NPLB K300 Drive 3 from n = 3000000
• 2025-03-05: Checked n = 2200000 - 3000000, NPLB K300 Drive 1, released
• 2024-05-05: Reserved by NPLB K300 Drive 1 from n = 2200000
• 2022-03-09: Checked n = 1400000 - 2222000, RPS Megabit Drive 3
• 2021-04-23: Found n = 2178673, Gary Barnes, RPS Megabit Drive 3
• 2021-03-21: Checked n = 1 - 1000000, Gary Barnes, double check, results included
• 2014-05-30: Reserved by RPS Megabit Drive 3 from n = 1400000
• 2012-12-27: Checked n = 1200000 - 1400000, Predrag Minovic, released
• 2012-09-15: Checked n = 1080000 - 1200000, Predrag Minovic
• 2012-08-20: Checked n = 1000000 - 1080000, Predrag Minovic
• 2009-09-15: Checked n = 700000 - 1000000, RPS Drive 9ks, released
• 2007-12-03: Reserved by RPS Drive 9ks for n = 700000 - 1000000
• 2007-02-02: none, Thomas Masser, released
• 2005-10-05: Checked n = 300000 - 700000, Thomas Masser
• 2005-04-26: Found n = 558313, Thomas Masser
• 2005-01-06: Checked n = 200000 - 300000, Thomas Masser
• 2005-01-04: Checked n = 200000 - <300000, Thomas Masser
• 2004-12-24: Checked n = 200000 - 210000, Steven Harvey
• 2004-06-04: Checked n = 250 - 10000, Predrag Minovic
• 2004-06-04: Reserved by Mark Anderson for n = 250 - 250000
• 1998-11-08: Found n = 48877, Kimmo Herranen
• 1998-11-05: Found n = 40113, Kimmo Herranen
• 1998-11-04: Found n = 31801, Kimmo Herranen
• 1998-11-03: Found n = 25863, Kimmo Herranen