Generalized Woodall primes of the form n•21n-1

Current data

ASCII format : n*21^n-1 Base : 21 Count : 8 Max n : 400,000 Date : 2024-10-25

2, 18, 200, 282, 294, 1174, 2492, 4348

History

• 2024-10-25: Checked n = 1 - 100000, Gary Barnes, double-check, released
• 2023-07-23: Checked n = 4000 - 40000?, (puadz), double-check
• 2023-07-03: Reserved by (puadz), double-check
• 2017-06-01: Checked n = 200000 - 400000, Steven Harvey
• 2016-12-14: Reserved by Steven Harvey for n = 200000 - 400000
• 2014-03-13: Checked to n = 25000, Steven Harvey, double-check
• 2012-10-10: Checked to n = 25000, Thomas Ritschel
• 2011-04-15: Checked n = 125000 - 200000, Steven Harvey
• 2011-03-16: Reserved by Steven Harvey to n = 200000
• 2010-11-01: Checked n = 20 - 4000, Steven Harvey, double-check
• 2009-10-07: Checked n = 40000 - 125000, Steven Harvey
• 2009-09-13: Reserved by Steven Harvey for n = 40000 - 125000
• 2002-12: Checked n = 20 - 4096, Mark Rodenkirch
• 2000-02-07: Found n = 4348, Joe DeMaio
• 2000-02-04: Found n = 2492, Joe DeMaio