A288409 Primes of the form k!2+64, where k!2 is the double factorial number (A006852).

67, 79, 1009, 10459, 34459489, 654729139, 316234143289, 2980227913743310874726229193921939

Offset: 1

Author

Robert Price, Jun 08 2017

Keywords

• nonn

Comments

The next term has 211 digits. - Harvey P. Dale, Feb 07 2019

Links

• Robert Price, Table of n, a(n) for n = 1..8
• Henri& Renaud Lifchitz, PRP Records.Search for n!2+64.
• Joe McLean, Interesting Sources of Probable Primes
• OpenPFGW Project, Primality Tester

Crossrefs

Cf. A076193.

Programs

Mathematica

MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 2] + 64, {i, 0, 100}], PrimeQ[#]&]
Select[Range[100]!!+64,PrimeQ] (* Harvey P. Dale, Feb 07 2019 *)