A288407 Primes of the form k!2+16, where k!2 is the double factorial number (A006852).

17, 19, 31, 135151, 34459441, 7905853580641, 213458046676891, 319830986772877770815641, 25373791335626257947657609391, 1192568192774434123539907640641, 157952079428395476360490147277859391

Offset: 1

Author

Robert Price, Jun 08 2017

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..12
• Henri& Renaud Lifchitz, PRP Records.Search for n!2+16.
• Joe McLean, Interesting Sources of Probable Primes
• OpenPFGW Project, Primality Tester

Crossrefs

Cf. A076189.

Programs

Mathematica

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] + 16, {i, 0, 100}], PrimeQ[#]&]