A288412 Primes of the form k!2+512, where k!2 is the double factorial number (A006852).

617, 135647, 2027537, 654729587, 7905853581137, 370285001030422820361936176659518850400275455268246313217966819668512968338481634393678502844088430422210693359887

Offset: 1

Author

Robert Price, Jun 08 2017

Keywords

• nonn

Links

• Robert Price, Table of n, a(n) for n = 1..8
• Henri& Renaud Lifchitz, PRP Records.Search for n!2+512.
• Joe McLean, Interesting Sources of Probable Primes
• OpenPFGW Project, Primality Tester

Crossrefs

Cf. A076196.

Programs

Mathematica

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] + 512, {i, 0, 100}], PrimeQ[#]&]