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Generalized Cullen primes of the form `n`•7ⁿ+1

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Current data

ASCII format :	n*7^n+1
Base :	7
Count :	4
Max `n` :	2,000,000
Date :	2023-07-14

34, 1980, 9898^[1], 474280

Remarks :

The sequence A242177 in OEIS

Notes

↑ Proth 202•7⁹⁹⁰⁰+1

History

2023-07-14: Checked to n = 2000000, Ryan Propper
2023-05-28: Checked to n = 500000, Mark Rodenkirch
2023-05-28: Found n = 474280, Mark Rodenkirch
2023-04-28: Reserved by Mark Rodenkirch to n=500000
2023-04-23: Checked n = 2 - 100000, Mark Rodenkirch, double-checked
1998-11-13: Found n = 9898, Wilfrid Keller
1990-01-01: Found n = 1980, Harvey Dubner

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Cullen prime