A289854 Primes of the form k!2-64, where k!2 is the double factorial number (A006852).

41, 881, 10331, 34459361, 13749310511, 213458046676811, 6190283353629311, 319830986772877770815561, 563862029680583509947946811, 25373791335626257947657609311, 488960130368663401543922783473071784646213671811

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..13

Henri & Renaud Lifchitz, PRP Records.Search for n!2-64.

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] - 64, {i, 7, 100}], PrimeQ[#]&]

Crossrefs

Cf. A259045.

Sequence in context: A010993 A208431 A275355 * A228257 A364994 A182359

Adjacent sequences: A289851 A289852 A289853 * A289855 A289856 A289857

Keyword

nonn

Author

Robert Price, Jul 13 2017

Status

approved