A289823 Primes of the form k!3-6561, where k!3 is the triple factorial number (A007661).
51679, 202879, 4182239, 608601439, 2504895839, 81359229945439, 664565853945439, 262134882788466681439, 2103662445439858602854085842728187330559993439, 17994728558292550488813850298696914425610239993439
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..13
- Henri & Renaud Lifchitz, PRP Records.Search for n!3-6561.
- Joe McLean, Interesting Sources of Probable Primes
- OpenPFGW Project, Primality Tester
Crossrefs
Cf. A261344.
Programs
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Mathematica
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]]; Select[Table[MultiFactorial[i, 3] - 6561, {i, 14, 100}], PrimeQ[#]&]