A292070 Primes of the form (40^k - 1) / 39.

41, 2625641, 4201025641, 70481514601025641025641025641, 180432677378625641025641025641025641, 739052246542850625641025641025641025641025641

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Mathematica

Select[Table[(40^k - 1) / 39, {k, 0, 100}], PrimeQ[#] &]

Crossrefs

Cf. A128005.

Sequence in context: A114927 A286915 A297056 * A297230 A087512 A297055

Adjacent sequences: A292067 A292068 A292069 * A292071 A292072 A292073

Keyword

nonn

Author

Robert Price, Sep 08 2017

Status

approved