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A288878 Primes of the form k!3 + 3^2, where k!3 is the triple factorial number (A007661). 1
11, 13, 19, 37, 89, 12329, 209449, 1106569, 24344329, 96342409, 2504902409, 17961239296009, 52580450364682240009, 2295148179742698933452800009, 7825229077844441903818866688000009, 145302140752338100885902776123355299840000009 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..24

Henri& Renaud Lifchitz, PRP Records.Search for n!3+3^2.

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] + 3^2, {i, 0, 100}], PrimeQ[#]&]

CROSSREFS

Cf. A247865.

Sequence in context: A167497 A068579 A048519 * A102907 A235479 A089774

Adjacent sequences:  A288875 A288876 A288877 * A288879 A288880 A288881

KEYWORD

nonn

AUTHOR

Robert Price, Jun 18 2017

STATUS

approved

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Last modified April 23 03:26 EDT 2019. Contains 322380 sequences. (Running on oeis4.)