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
Keywords
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
Crossrefs
Cf. A289696.
Programs
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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 *)