A288614 - OEIS

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A288614

Primes of the form k!6+18, where k!6 is the sextuple factorial number (A085158).

19, 23, 73, 109, 953, 1747, 21523, 1339993, 49579093, 894930593, 104463111043, 3879320022245629336393, 131181879631714694053764558690643, 5685668465320307573857236025777988251766371484393, 164577616892349380880997566903814398769391101461559752758998046893

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..15

Henri& Renaud Lifchitz, PRP Records.Search for n!6+18.

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] + 18, {i, 0, 100}], PrimeQ[#]&]

Select[Table[(Times@@Range[k, 1, -6])+18, {k, 250}], PrimeQ] (* Harvey P. Dale, Dec 14 2021 *)