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A288885
Primes of the form k!3 + 3^9, where k!3 is the triple factorial number (A007661).
1
19687, 19763, 19963, 20563, 32003, 229123, 4208483, 24364003, 72642189283, 2324549446883, 5577337931669523683, 38900816605808456499219683, 26070192823309041523916819683
OFFSET
1,1
LINKS
MATHEMATICA
MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
Select[Table[MultiFactorial[i, 3] + 3^9, {i, 0, 100}], PrimeQ[#]&]
Select[Table[Times@@Range[n, 1, -3]+19683, {n, 100}], PrimeQ] (* Harvey P. Dale, Sep 18 2023 *)
CROSSREFS
Cf. A265378.
Sequence in context: A352037 A321813 A081866 * A253493 A253500 A253454
KEYWORD
nonn
AUTHOR
Robert Price, Jun 18 2017
STATUS
approved