Riesel primes of the form 9•10n-1

Current data

k , b : 9 , 10 Count : 22 Nash : 3518 Max n : 600,000 Date : 2024-09-30

1, 3, 7, 19, 29, 37, 93, 935, 8415, 9631, 11143, 41475, 41917, 48051, 107663, 212903, 223871, 260253, 364521, 383643, 1009567, 1762063

Remarks :

The sequence A056725 in OEIS See also Near-repdigit 899...99 Studio Kamada See also Williams 9•10n-1

History

• 2024-09-30: Checked n = 230000 - 600000, Gary Barnes
• 2024-09-24: Reserved by Gary Barnes for n = 230000 - 600000
• 2024-08-26: Checked n = 2 - 100000, Mark Rodenkirch, double-check, released
• 2024-08-22: Reserved by Mark Rodenkirch for n = 2 - 100000, double-check
• 2021-10-05: Checked n = 1040001 - 1050000, Predrag Kurtovic
• 2021-01-10: Checked n = 1030001 - 1040000, Predrag Kurtovic
• 2020-08-04: Found n = 1762063, Ryan Propper
• 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
• 2016-09-19: Checked n = 1000001 - 1010000, Predrag Kurtovic
• 2016-09-19: Found n = 1009567, Predrag Kurtovic
• 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
• 2011-01-07: Found n = 383643, David Broadhurst
• 2010-12-19: Found n = 364521, David Broadhurst
• 2010-12-01: Checked n = 1 - 100000, Gary Barnes, double-check n = 1 - 30000
• 2010-11-09: Found n = 223871, David Broadhurst
• 2010-11-05: Found n = 260253, David Broadhurst
• 2010-11-04: Found n = 212903, David Broadhurst
• 2010-09-30: Checked n = 1 - 30000, Ray Chandler
• 2006-10-30: Checked to n = 5000, Hugo Platzer
• 2004-01-21: Found n = 107663, Jiong Sun
• 2002-01-23: Found n = 41917, Eric J. Sorensen
• 2000-12-10: Found n = 48051, Harvey Dubner
• 2000-10-27: Found n = 41475, Dirk Augustin
• 2000-08-11: Checked n = 1 - 6750, Robert G. Wilson
• 1994-12-01: Found n = 11143, Harvey Dubner
• 1994-10-01: Found n = 9631, Harvey Dubner
• 1994-10-01: Found n = 8415, Harvey Dubner
• ?: Found n = 935, Robert G. Wilson