A288609 Primes of the form k!6+4, where k!6 is the sextuple factorial number (A085158).

5, 7, 11, 31, 59, 409, 1733, 229639, 21827579, 131527051677179, 606997343490162629, 12604484198222791879, 32799650788086796039050629, 1140711996797519078728387466879, 7575339494576348459668940121110928768987796879

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..23

Henri& Renaud Lifchitz, PRP Records.Search for n!6+4.

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, 6] + 4, {i, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A287914.

Sequence in context: A092029 A259564 A308764 * A156559 A018426 A038976

Adjacent sequences: A288606 A288607 A288608 * A288610 A288611 A288612

Keyword

nonn

Author

Robert Price, Jun 11 2017

Status

approved