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A289817
Primes of the form k!3-9, where k!3 is the triple factorial number (A007661).
1
19, 71, 271, 3631, 58231, 209431, 4188791, 96342391, 17041023991, 72642169591, 2324549427191, 1143053268797439991, 52580450364682239991, 262134882788466687991, 694657439389436723199991, 38900816605808456499199991, 2295148179742698933452799991
OFFSET
1,1
LINKS
MATHEMATICA
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 3] - 9, {i, 5, 100}], PrimeQ[#]&]
CROSSREFS
Cf. A243078.
Sequence in context: A342737 A142516 A127874 * A321343 A255889 A154406
KEYWORD
nonn
AUTHOR
Robert Price, Jul 12 2017
STATUS
approved