Riesel primes of the form 8•10n-1

Current data

k , b : 8 , 10 Count : 24 Nash : 4046 Max n : 600,000 Date : 2024-10-06

1, 4, 5, 8, 10, 25, 49, 76, 128, 175, 238, 550, 796, 1219, 2012, 2846, 11336, 21296, 49808, 74318, 236891, 608989, 1715905, 5112847

Remarks :

sequence A056721 in OEIS See also Near-repdigit 799...99 Studio Kamada

History

• 2024-10-06: Checked n = 230000 - 600000, Gary Barnes, released
• 2024-09-24: Reserved by Gary Barnes for n = 230000 - 600000
• 2024-01-30: Found n = 5112847, Ryan Propper, Serge Batalov
• 2020-08-04: Found n = 1715905, Ryan Propper, Serge Batalov
• 2017-10-13: Checked n = 1085000 - 1100000, Predrag Kurtovic
• 2017-10-07: Checked n = 1060001 - 1085000, Predrag Kurtovic
• 2017-09-22: Checked n = 1040001 - 1060000, Predrag Kurtovic
• 2017-01-23: Checked n = 1030001 - 1040000, Predrag Kurtovic
• 2016-03-23: Checked n = 1016001 - 1030000, Predrag Kurtovic
• 2015-01-17: Checked n = 1000001 - 1016000, Predrag Kurtovic
• 2011-05-25: Found n = 608989, David Broadhurst
• 2011-04-17: Checked n = 200000 - 230000, Gary Barnes
• 2011-02-20: Checked n = 150000 - 200000, Gary Barnes
• 2011-01-18: Checked n = 100000 - 150000, Gary Barnes
• 2010-12-01: Checked n = 1 - 100000, Gary Barnes, double-check n = 1 - 30000
• 2010-11-06: Found n = 236891, David Broadhurst
• 2010-09-30: Checked n = 1 - 30000, Ray Chandler
• 2005-02-20: Checked n = 1600 - 3000,  ??
• 2004-09-01: Found n = 74318, Eric J. Sorensen
• 2002-01-03: Found n = 49808, Eric J. Sorensen
• 2001-09-16: Found n = 21296, Eric J. Sorensen
• 2000-08-11: Checked n = 1 - 1600, Robert G. Wilson
• 2000-02-17: Found n = 2846, Ray Ballinger
• 2000-02-17: Found n = 2012, Ray Ballinger
• 1994-12-01: Found n = 11336, Harvey Dubner