A289734 Primes of the form k!6-27, where k!6 is the sextuple factorial number (A085158).
13, 197, 613, 13404133, 24663654373, 37455569511954513919973, 448140631309739369262009548799973, 38794993239276710062728555790335999973
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..11
- Henri & Renaud Lifchitz, PRP Records.Search for n!6-27.
- Joe McLean, Interesting Sources of Probable Primes
- OpenPFGW Project, Primality Tester
Crossrefs
Cf. A289698.
Programs
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Mathematica
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 6] - 27, {i, 9, 100}], PrimeQ[#]&] Select[Table[Times@@Range[n,1,-6]-27,{n,10,200}],PrimeQ] (* Harvey P. Dale, Aug 22 2020 *)