Generalized Woodall primes of the form n•9n-1

Current data

ASCII format : n*9^n-1 Base : 9 Count : 7 Max n : 975,000 Date : 2024-02-14

10, 58, 264, 1568, 4198, 24500, 4788920

Remarks :

The sequence A242202 in OEIS

History

• 2024-02-14: Found n = 4788920, Ryan Propper, Serge Batalov
• 2014-07-09: Checked n = 250000 - 975000, Serge Batalov
• 2014-03-13: Checked to n = 25000, Steven Harvey, double-check
• 2012-10-10: Checked to n = 25000, Thomas Ritschel
• 2011-03-09: Checked n = 200000 - 250000, Steven Harvey
• 2011-01-31: Reserved by Steven Harvey for n = 200000 - 250000
• 2010-11-01: Checked n = 8 - 4000, Steven Harvey, double-check
• 2008-12-14: Checked n = 140000 - 200000, Mark Rodenkirch
• 2008-11-26: Reserved by Mark Rodenkirch to n = 200000
• 2008-11-26: Checked n = 100000 - 140000, Mark Rodenkirch
• 2007-02-08: Checked n = 60000 - 100000, Steven Harvey
• 2007-01-06: Reserved by Steven Harvey to n = 100000
• 2005-01-03: Checked n = 5000 - 10000, Mark Rodenkirch
• 2004-12-21: Reserved by Mark Rodenkirch to n = 10000
• 2004-12-21: Checked n = 8 - 5000, Mark Rodenkirch
• 2004-12-15: Reserved by Mark Rodenkirch to n = 6000
• 2004-12-03: Reserved by Mark Rodenkirch to n = 5000
• 2004-10-12: Checked to n = 60000, Steven Harvey
• 2004-10-06: Reserved by Steven Harvey to n = 60000
• 2000-06-03: Found n = 24500, Ray Ballinger
• 2000-02-05: Found n = 4198, Joe DeMaio