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A288879 Primes of the form k!3 + 3^3, where k!3 is the triple factorial number (A007661). 1
29, 31, 37, 107, 307, 907, 12347, 4188827, 96342427, 2324549427227, 17961239296027, 52580450364682240027, 262134882788466688027, 142299187144047333874073600027, 1414585397090614713326770033423904956109645017737276725445918510284800000000027 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Price, Table of n, a(n) for n = 1..19

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

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

CROSSREFS

Cf. A247886.

Sequence in context: A007641 A050656 A050667 * A102906 A178456 A069453

Adjacent sequences:  A288876 A288877 A288878 * A288880 A288881 A288882

KEYWORD

nonn

AUTHOR

Robert Price, Jun 18 2017

STATUS

approved

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Last modified December 1 11:35 EST 2021. Contains 349429 sequences. (Running on oeis4.)