A288891 Primes of the form k!6+2, where k!6 is the sextuple factorial number (A085158).
3, 5, 7, 29, 937, 229637, 13299311027, 678264862277, 2229272062327, 8260613413473469333910627, 204676724960380351177777255683652821505300292407056383439453127, 359539042675600162641430486036393282148945045174959856388131309765627
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..15
- Henri& Renaud Lifchitz, PRP Records.Search for n!6+2.
- Joe McLean, Interesting Sources of Probable Primes
- OpenPFGW Project, Primality Tester
Crossrefs
Cf. A287207.
Programs
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Mathematica
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 6] + 2, {i, 0, 100}], PrimeQ[#]&] Select[Table[Times@@Range[n,1,-6]+2,{n,250}],PrimeQ] (* Harvey P. Dale, Nov 20 2024 *)