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A289634
Primes of the form k!3-3, where k!3 is the triple factorial number (A007661).
1
7, 277, 877, 3637, 58237, 24344317, 17041023997, 44656330909544934316361777151999997, 3304568487306325139410771509247999997, 17994728558292550488813850298696914425610239999997, 2136063198892150618502015301628828867230815945271103455231999999997
OFFSET
1,1
LINKS
MATHEMATICA
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 3] - 3, {i, 4, 100}], PrimeQ[#]&]
Select[Table[Times@@Range[n, 1, -3]-3, {n, 2, 200}], PrimeQ] (* Harvey P. Dale, Nov 25 2022 *)
CROSSREFS
Cf. A242994.
Sequence in context: A066413 A332127 A222942 * A065581 A062646 A009503
KEYWORD
nonn
AUTHOR
Robert Price, Jul 12 2017
STATUS
approved