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A292070
Primes of the form (40^k - 1) / 39.
0
41, 2625641, 4201025641, 70481514601025641025641025641, 180432677378625641025641025641025641, 739052246542850625641025641025641025641025641
OFFSET
1,1
MATHEMATICA
Select[Table[(40^k - 1) / 39, {k, 0, 100}], PrimeQ[#] &]
CROSSREFS
Cf. A128005.
Sequence in context: A114927 A286915 A297056 * A297230 A087512 A297055
KEYWORD
nonn
AUTHOR
Robert Price, Sep 08 2017
STATUS
approved