Generalized Woodall primes of the form n•20n-1

Current data

Base : 20 Count : 15 Max n : 1,600,000 Date : 2023-08-10

1, 18, 44, 60, 80, 123, 429, 1166, 2065, 8774, 35340, 42968, 50312, 210129, 663703

Remarks :

The sequence A299383 in OEIS See early history at Generalized Woodall news, Generalized Woodall primes, & Generalized Woodall completed ranges.

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
• 2023-04-10: Checked n = 400000 - 1000000, Ryan Propper
• 2023-04-09: Found n = 663703, Ryan Propper
• 2023-04-01: Reserved by Ryan Propper to n = 1000000
• 2016-12-14: Checked n = 200000 - 400000, Steven Harvey
• 2016-02-08: Found n = 210129, Steven Harvey
• 2016-02-08: Reserved by Steven Harvey to n = 400000
• 2014-03-13: Checked n = 4000 - 25000, Steven Harvey, double-check
• 2012-10-10: Checked to n = 25000, Thomas Ritschel
• 2011-06-27: Checked n = 125000 - 200000, Steven Harvey
• 2011-03-16: Reserved by Steven Harvey to n = 200000
• 2010-11-01: Checked n = 19 - 4000, Steven Harvey, double-check
• 2009-09-15: Checked n = 90000 - 125000, Steven Harvey
• 2009-08-30: Reserved by Steven Harvey for n = 90000 - 125000
• 2009-02-04: Checked to n = 90000, Dirk Augustin
• 2005-02-26: Reserved by Dirk Augustin 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 = 19 - 5000, Mark Rodenkirch
• 2004-12-15: Reserved by Mark Rodenkirch to n = 6000
• 2004-12-03: Reserved by Mark Rodenkirch to n = 5000
• 2002-03-11: Found n = 50312, Dirk Augustin
• 2001-12-28: Found n = 42968, Dirk Augustin
• 2001-11-28: Found n = 35340, Dirk Augustin
• 2000-02-25: Found n = 8774, Dirk Augustin
• 2000-02-04: Found n = 2065, Joe DeMaio