A289732 Primes of the form k!6-18, where k!6 is the sextuple factorial number (A085158).

37, 73, 21487, 43207, 21827557, 11510631741140058401857, 345259481979861010937357, 1047467488443745314570607, 10465247677041459437875114357, 2015871944300559703524199973398834357, 5685668465320307573857236025777988251766371484357

Offset

1,1

Links

Robert Price, Table of n, a(n) for n = 1..14

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, 9, 100}], PrimeQ[#]&]
Select[Table[Times@@Range[n, 1, -6]-18, {n, 10, 300}], PrimeQ] (* Harvey P. Dale, Jul 07 2019 *)

Crossrefs

Cf. A289696.

Sequence in context: A217386 A083990 A123815 * A087531 A283718 A085959

Adjacent sequences: A289729 A289730 A289731 * A289733 A289734 A289735

Keyword

nonn

Author

Robert Price, Jul 10 2017

Status

approved