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Generalized Cullen primes of the form `n`•18ⁿ+1

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Current data

Base :	18
Count :	16
Max `n` :	1,000,000
Date :	2023-05-20

1, 3, 21, 23, 842, 1683, 3401, 16839, 49963, 60239, 150940, 155928, 219525, 342091, 353901, 612497

History

2023-05-20: Checked to n = 1000000, Ryan Propper, released
2023-05-19: Found n = 612497, Ryan Propper
2023-05-18: Reserved by Ryan Propper to n=1000000
2023-04-25: Checked to n = 100000, Mark Rodenkirch, double-checked
?: Checked to n = 203597 , (?)
2002-05-20: Found n = 60239, Günter Löh
2000-11-02: Found n = 49963, Günter Löh
2000-05-15: Found n = 16839, Günter Löh
2000: Found n = 3401, Wilfrid Keller
1990-01-01: Found n = 1683, Harvey Dubner
1990-01-01: Found n = 842, Harvey Dubner

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Cullen prime