A291687 Primes of the form k!4+4, where k!4 is the quadruple factorial number (A007662).
5, 7, 3469, 9949, 65839, 1514209, 5221129, 40883539, 151412629, 44358635479, 16713607661375629, 36453104912477522894629, 1027438963906784290227656915629, 7419136758370889359733910587728129, 4551830726072842264843919206776501006328129
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..18
- Henri& Renaud Lifchitz, PRP Records.Search for n!4+4.
- Joe McLean, Interesting Sources of Probable Primes
- OpenPFGW Project, Primality Tester
Crossrefs
Cf. A291122.
Programs
-
Mathematica
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 4] + 4, {i, 0, 100}], PrimeQ[#]&]