A289490 Primes of the form k!4+8, where k!4 is the quadruple factorial number (A007662).

11, 13, 29, 53, 239, 593, 65843, 1514213, 5221133, 4996616633, 1729986783533, 7579867420133, 36453104912477522894633, 2442358029135994033939883, 173407420068655576409731133, 534602198949923693866675351078133, 7419136758370889359733910587728133

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..22

Henri& Renaud Lifchitz, PRP Records.Search for n!4+8.

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, 4] + 8, {i, 0, 100}], PrimeQ[#]&]

Crossrefs

Cf. A291343.

Sequence in context: A107645 A106014 A261371 * A056251 A222805 A089755

Adjacent sequences: A289487 A289488 A289489 * A289491 A289492 A289493

Keyword

nonn

Author

Robert Price, Sep 02 2017

Status

approved