Riesel primes of the form 5•10n-1

Current data

k , b : 5 , 10 Count : 25 Nash : 4400 Max n : 600,000 Date : 2024-10-06

2, 3, 4, 6, 14, 54, 210, 390, 594, 3460, 5028, 5219, 5332, 8072, 15796, 16131, 21456, 29282, 78790, 85142, 179972, 211029, 445773, 464843, 511056

Remarks :

sequence A056712 in OEIS See also Near-repdigit 499...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
• 2021-10-05: Checked n = 1040001 - 1050000, Predrag Kurtovic
• 2021-01-10: Checked n = 1030001 - 1040000, Predrag Kurtovic
• 2019-01-29: Checked n = 1020001 - 1030000, Predrag Kurtovic
• 2017-11-08: Checked n = 1015001 - 1020000, Predrag Kurtovic
• 2017-06-12: Checked n = 1010001 - 1015000, Predrag Kurtovic
• 2016-09-05: Checked n = 1000001 - 1010000, Predrag Kurtovic
• 2011-04-17: Checked n = 200000 - 230000, Gary Barnes
• 2011-03-16: Found n = 511056, David Broadhurst
• 2011-02-20: Checked n = 150000 - 200000, Gary Barnes
• 2011-02-13: Found n = 464843, David Broadhurst
• 2011-01-31: Found n = 445773, David Broadhurst
• 2011-01-18: Checked n = 100000 - 150000, Gary Barnes
• 2010-12-01: Checked n = 1 - 100000, Gary Barnes, double-check n = 1 - 30000
• 2010-11-04: Found n = 211029, David Broadhurst
• 2010-10-17: Found n = 179972, David Broadhurst
• 2010-09-30: Checked n = 1 - 30000, Ray Chandler
• 2005-10-09: Found n = 85142, Eric J. Sorensen
• 2005-02-20: Checked n = 1600 - 4660,  ??
• 2005-01-04: Found n = 78790, Eric J. Sorensen
• 2001-10-08: Found n = 29282, Eric J. Sorensen
• 2001-09-25: Found n = 21456, Eric J. Sorensen
• 2000-08-11: Checked n = 1 - 1600, Robert G. Wilson
• 1999-06-16: Found n = 16131, Harvey Dubner
• 1999-06-16: Found n = 15796, Harvey Dubner
• 1994-10-01: Found n = 8072, Harvey Dubner
• 1991: Found n = 5028, Harvey Dubner
• 1989: Found n = 3460, Chris Caldwell, Harvey Dubner