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Generalized Cullen primes of the form `n`•21ⁿ+1

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Current data

ASCII format :	n*21^n+1
Base :	21
Count :	4
Max `n` :	277,711
Date :	2024-10-25

2^[1], 8, 26, 67100

Notes

↑ Twin n=2

History

2024-10-25: Checked n = 1 - 100000, Gary Barnes, double-check, released
2012: Checked n = 4685 - 277711, Günter Löh
2003-07-31: Found n = 67100, Günter Löh
2000: Checked n = 1 - 4685, Wilfrid Keller

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Cullen prime