A289860 Primes of the form k!4 - 2, where k!4 is the quadruple factorial number (A007662).
2, 3, 19, 43, 229, 3463, 208843, 5221123, 151412623, 16713607661375623, 1027438963906784290227656915623, 7419136758370889359733910587728123, 64138437276116338514899657030909640623, 99213846986734491072350087622336908512964418837890623
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..23
- Henri and Renaud Lifchitz, PRP Records.Search for n!4-2.
- Joe McLean, Interesting Sources of Probable Primes.
- OpenPFGW Project, Primality Tester.
Programs
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Mathematica
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 4] - 2, {i, 3, 100}], PrimeQ[#]&]