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A289732 Primes of the form k!6-18, where k!6 is the sextuple factorial number (A085158). 1
37, 73, 21487, 43207, 21827557, 11510631741140058401857, 345259481979861010937357, 1047467488443745314570607, 10465247677041459437875114357, 2015871944300559703524199973398834357, 5685668465320307573857236025777988251766371484357 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 1 11:19 EST 2022. Contains 358468 sequences. (Running on oeis4.)