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

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Current data

ASCII format :	n*21^n-1
Base :	21
Count :	8
Max `n` :	400,000
Date :	2023-07-23

2^[1], 18, 200, 282, 294^[2], 1174, 2492, 4348

Notes

↑ Twin n=2
↑ Riesel 14•21²⁹⁵-1

History

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
2009-10-07: Checked n = 40000 - 125000, Steven Harvey
2009-09-13: Reserved by Steven Harvey for n = 40000 - 125000
2005-01-03: Checked n = 5000 - 10000, Mark Rodenkirch
2004-12-21: Reserved by Mark Rodenkirch to n = 10000
2004-12-21: Checked n = 20 - 5000, Mark Rodenkirch
2004-12-15: Reserved by Mark Rodenkirch to n = 6000
2004-12-03: Reserved by Mark Rodenkirch to n = 5000
2000-02-07: Found n = 4348, Joe DeMaio
2000-02-04: Found n = 2492, Joe DeMaio

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Woodall prime