A292070 Primes of the form (40^k - 1) / 39.
41, 2625641, 4201025641, 70481514601025641025641025641, 180432677378625641025641025641025641, 739052246542850625641025641025641025641025641
Offset: 1
Keywords
Crossrefs
Cf. A128005.
Programs
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Mathematica
Select[Table[(40^k - 1) / 39, {k, 0, 100}], PrimeQ[#] &]