Generalized Woodall primes of the form n•10n-1

Current data

ASCII format : n*10^n-1 Base : 10 Count : 18 Max n : 1,600,000 Date : 2023-08-10

2, 3, 8, 11, 15, 39, 60, 72, 77, 117, 183, 252, 396, 1745, 2843, 4665, 5364, 524427

Remarks :

The sequence A059671 in OEIS See early history at Generalized Woodall news and Generalized Woodall primes.

History

• 2023-08-10: none, Ryan Propper, released
• 2023-04-29: Checked n = 1000000 - 1600000, Ryan Propper
• 2023-04-19: Reserved by Ryan Propper to n = 1600000
• 2023-04-09: Checked n = 500000 - 1000000, Ryan Propper
• 2023-04-02: Found n = 524427, Ryan Propper
• 2023-04-01: Reserved by Ryan Propper to n = 1000000
• 2015-04-28: Checked n = 250000 - 500000, Steven Harvey
• 2015-03-25: Reserved by Steven Harvey for n = 250000 - 500000
• 2014-03-13: Checked n = 4000 - 25000, Steven Harvey, double-check n = 4000 - 10000
• 2011-03-03: Checked n = 200000 - 250000, Steven Harvey
• 2011-01-31: Reserved by Steven Harvey for n = 200000 - 250000
• 2010-11-01: Checked n = 9 - 4000, Steven Harvey, double-check
• 2009-01-18: Checked n = 100000 - 200000, Mark Rodenkirch
• 2008-04-24: Checked n = 60000 - 100000, Steven Harvey
• 2005-01-03: Checked n = 5000 - 10000, Mark Rodenkirch
• 2004-12-21: Reserved by Mark Rodenkirch to n = 10000
• 2004-12-21: Checked n = 9 - 5000, Mark Rodenkirch
• 2004-12-15: Reserved by Mark Rodenkirch to n = 6000
• 2004-12-03: Reserved by Mark Rodenkirch to n = 5000
• 2004-10-26: Checked n = 50000 - 60000, Steven Harvey
• 2004-10-12: Reserved by Steven Harvey for n = 50000 - 60000
• 2000-02-07: Found n = 5364, Ray Ballinger
• 2000-02-05: Found n = 4665, Joe DeMaio
• 2000-02-04: Found n = 2843, Joe DeMaio
• 1997-03-03: Found n = 1745, Carlos Rivera