A289859 Primes of the form k!2-2, where k!2 is the sextuple factorial number (A085158).

13, 103, 2027023, 34459423, 654729073, 2980227913743310874726229193921873, 174865344543353986303948473285124243127671456831640623, 352999527454840466971061863960307904899505075341088595453568994140623

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..10

Henri & Renaud Lifchitz, PRP Records.Search for n!2-2.

Joe McLean, Interesting Sources of Probable Primes

OpenPFGW Project, Primality Tester

Mathematica

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] - 2, {i, 3, 100}], PrimeQ[#]&]

Crossrefs

Cf. A085158, A283485.

Sequence in context: A087398 A080440 A159352 * A129762 A283121 A278555

Adjacent sequences: A289856 A289857 A289858 * A289860 A289861 A289862

Keyword

nonn

Author

Robert Price, Jul 13 2017

Status

approved