A289821 Primes of the form k!3-729, where k!3 is the triple factorial number (A007661).
151, 2504901671, 664565853951271, 3091650738175271, 26582634158079271, 126757680265215271, 142299187144047333874073599271, 546216992715109618958387336810111087297326406997164406744285183999999999271
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..13
- Henri & Renaud Lifchitz, PRP Records.Search for n!3-729.
- Joe McLean, Interesting Sources of Probable Primes
- OpenPFGW Project, Primality Tester
Crossrefs
Cf. A247466.
Programs
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Mathematica
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 3] - 729, {i, 11, 100}], PrimeQ[#]&]