A289550 Primes of the form k!6-4, where k!6 is the sextuple factorial number (A085158).
2, 3, 23, 401, 8501, 229631, 623641
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..10
- Henri & Renaud Lifchitz, PRP Records.Search for n!6-4.
- Joe McLean, Interesting Sources of Probable Primes
- OpenPFGW Project, Primality Tester
Crossrefs
Cf. A289547.
Programs
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Mathematica
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 6] - 4, {i, 4, 100}], PrimeQ[#]&] Select[Table[Times@@Range[n,1,-6]-4,{n,3,100}],PrimeQ] (* Harvey P. Dale, Dec 09 2020 *)
Comments