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

1,1

Links

Robert Price, Table of n, a(n) for n = 1..16

Henri& Renaud Lifchitz, PRP Records.Search for n!3+3^4.

Joe McLean, Interesting Sources of Probable Primes

OpenPFGW Project, Primality Tester

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 *)

Crossrefs

Cf. A247866.

Sequence in context: A033252 A347226 A261449 * A126117 A096279 A340817

Adjacent sequences: A288877 A288878 A288879 * A288881 A288882 A288883

Keyword

nonn

Author

Robert Price, Jun 18 2017

Status

approved