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A288880 Primes of the form k!3 + 3^4, where k!3 is the triple factorial number (A007661). 1
83, 109, 12401, 58321, 24344401, 96342481, 2504902481, 26582634158080081, 1143053268797440081, 262134882788466688081, 427380210218181008588800081, 142299187144047333874073600081, 7825229077844441903818866688000081 (list; graph; refs; listen; history; text; internal format)
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: A031412 A033252 A261449 * A126117 A096279 A340817

Adjacent sequences:  A288877 A288878 A288879 * A288881 A288882 A288883

KEYWORD

nonn

AUTHOR

Robert Price, Jun 18 2017

STATUS

approved

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Last modified October 18 21:56 EDT 2021. Contains 348070 sequences. (Running on oeis4.)