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Generalized Cullen primes of the form `n`•20ⁿ+1

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Revision as of 10:02, 10 October 2024 by Gd barnes (talk | contribs) (add history & remarks, remove incorrect prime)

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Current data

ASCII format :	n*20^n+1
Base :	20
Count :	9
Max `n` :	1,000,000
Date :	2023-05-20

3, 6207, 8076, 22356, 151456, 329994, 364595, 793181, 993149

Remarks :

The sequence A338412 in OEIS
See early history at Generalized Cullen primes

History

2023-05-20: Checked n = 219976 - 1000000, Ryan Propper
2023-05-20: Found n = 993149, Ryan Propper
2023-05-20: Found n = 793181, Ryan Propper
2023-05-18: Reserved by Ryan Propper to n = 1000000
2023-04-25: Checked n = 2 - 100000, Mark Rodenkirch, double-check
?: Checked to n = 219976, (?)
2011-12-21: Found n = 151456, Günter Löh
2000-06-04: Found n = 22356, Günter Löh
2000-02-07: Found n = 8076, Günter Löh
2000-01-31: Found n = 6207, Günter Löh

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Cullen prime