Riesel primes of the form 47•2n-1

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

Current data

k , b : 47 , 2 Type : Low Count : 20 Nash : 922 Max n : 3,100,000 Date : 2025-03-12 Reserved : No Prime Left BehindNo Prime Left Behind/Reserved

4, 14, 70, 78, 1374, 1824, 2158, 2654, 4494, 9598, 10068, 11524, 15128, 55408, 87324, 450470, 540494, 695384, 695724, 1025950

Remarks :

The sequence A050549 in OEIS

History

• 2025-03-12: Reserved by NPLB K300 Drive 2 from n = 3100000
• 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 = 1000000 - 1653000, 1692000 - 3000000, RPS Megabit Drive 1
• 2011-01-30: Found n = 1025950, Predrag Minovic, RPS Megabit Drive 1
• 2011-01-26: Reserved by RPS Megabit Drive 1 from n = 1000000
• 2010-04-30: Sieving, James P. Burt
• 2009-01-09: Checked n = 950000 - 998779, 1140064 - 1142960, 1652060 - 1692888, 1967588 - 1968430, Peter Benson
• 2008-11-11: Checked n = 700000 - 1000000, Gary Barnes
• 2008-11-05: Checked n = 541000 - 700000, Gary Barnes
• 2008-10-31: Found n = 695724, Gary Barnes
• 2008-10-31: Found n = 695384, Gary Barnes
• 2008-10-31: Checked n = 420000 - 541000, Gary Barnes, double-check n = 420000 - 500000
• 2008-10-31: Found n = 540494, Gary Barnes
• 2008-09-21: Checked n = 247000 - 420000, Gary Barnes, double-check
• 2008-09-10: Checked n = 210000 - 247000, Gary Barnes, double-check
• 2008-09-07: Reserved by Gary Barnes for n = 210000 - 600000, double-check n = 210000 - 500000
• 2006-03-23: Checked n = 120000 - 200000, Thomas Ritschel, double-check
• 2006-02-06: Checked n = 100000 - 110000, Thomas Ritschel, double-check
• 2004-11-28: Checked n = 210000 - 500000, Jeffrey Sax
• 2004-11-02: Found n = 450470, Jeffrey Sax
• 2004-08-01: Checked n = 200000 - 210000, Steven Harvey, released
• 2004-07-26: Reserved by Steven Harvey for n = 200000 - 210000