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A288609 Primes of the form k!6+4, where k!6 is the sextuple factorial number (A085158). 1
5, 7, 11, 31, 59, 409, 1733, 229639, 21827579, 131527051677179, 606997343490162629, 12604484198222791879, 32799650788086796039050629, 1140711996797519078728387466879, 7575339494576348459668940121110928768987796879 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Henri& Renaud Lifchitz, PRP Records.Search for n!6+4.
OpenPFGW Project, Primality Tester
MATHEMATICA
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 6] + 4, {i, 0, 100}], PrimeQ[#]&]
CROSSREFS
Cf. A287914.
Sequence in context: A092029 A259564 A308764 * A156559 A018426 A038976
KEYWORD
nonn
AUTHOR
Robert Price, Jun 11 2017
STATUS
approved

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Last modified March 29 06:44 EDT 2024. Contains 371265 sequences. (Running on oeis4.)