Riesel primes of the form 2•10n-1

Current data

k , b : 2 , 10 Count : 28 Nash : 4398 Max n : 600,000 Date : 2024-09-25

1, 2, 3, 5, 7, 26, 27, 53, 147, 236, 248, 386, 401, 546, 785, 1325, 1755, 2906, 3020, 5407, 5697, 5969, 7517, 15749, 19233, 38232, 55347, 1059002

Remarks :

sequence A002957 in OEIS See also Near-repdigit 199...99 Studio Kamada

History

• 2024-09-25: Checked n = 410000 - 500000, Gary Barnes, released
• 2024-09-24: Reserved by Gary Barnes for n = 410000 - 500000
• 2013-10-31: Checked n = 400000 - 410000, Predrag Kurtovic
• 2013-09-17: Checked n = 1000000 - 1059700, Serge Batalov
• 2013-09-17: Found n = 1059002, Serge Batalov
• 2013-09-17: Checked n = 500000 - 600000, Predrag Kurtovic
• 2013-09-02: Checked n = 350000 - 400000, Predrag Kurtovic
• 2013-08-31: Checked n = 300000 - 350000, Predrag Kurtovic
• 2013-08-21: Checked n = 230000 - 300000, 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
• 2010-12-01: Checked n = 1 - 100000, Gary Barnes, double-check n = 1 - 30000
• 2010-09-30: Checked n = 1 - 30000, Ray Chandler
• 2005-02-20: Checked n = 4800 - 15000,  ??
• 2002-07-18: Found n = 55347, Eric J. Sorensen
• 2001-09-03: Found n = 38232, Eric J. Sorensen
• 2001-02-02: Checked n = 1 - 4800, Robert G. Wilson
• 2000-09-21: Found n = 19233, Roland Clarkson
• 1999-06-16: Found n = 15749, Harvey Dubner
• 1994-10-01: Found n = 5969, Harvey Dubner
• 1994-10-01: Found n = 5697, Harvey Dubner
• 1994-10-01: Found n = 5407, Harvey Dubner
• 1993-07: Found n = 7517, Harvey Dubner
• 1985: Found n = 3020, Hugh C. Williams
• 1985: Found n = 2906, Hugh C. Williams
• 1985: Found n = 1755, Hugh C. Williams
• 1985: Found n = 1325, Hugh C. Williams