A288880 Primes of the form k!3 + 3^4, where k!3 is the triple factorial number (A007661).
83, 109, 12401, 58321, 24344401, 96342481, 2504902481, 26582634158080081, 1143053268797440081, 262134882788466688081, 427380210218181008588800081, 142299187144047333874073600081, 7825229077844441903818866688000081
Offset: 1
Keywords
Links
- Robert Price, Table of n, a(n) for n = 1..16
- Henri and Renaud Lifchitz, PRP Records.Search for n!3+3^4.
- 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, 3] + 3^4, {i, 0, 100}], PrimeQ[#]&] Select[Table[Times@@Range[n,1,-3]+81,{n,100}],PrimeQ] (* Harvey P. Dale, Aug 13 2021 *)