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A283594
Numbers k such that k![12]+2 is prime, where k![12] is the twelve-fold multifactorial.
1
0, 1, 3, 5, 9, 11, 15, 21, 27, 29, 39, 99, 159, 213, 249, 351, 443, 489, 513, 563, 705, 1059, 1599, 1733, 2361, 3699, 4263, 4451, 4479, 5141, 5751, 7355, 7461, 8525, 8861, 18231, 19629, 23571, 41789, 76973, 86997, 93735, 98943
OFFSET
1,3
COMMENTS
a(44) > 10^5.
The first 12 primes associated with this sequence: 3, 3, 5, 7, 11, 13, 47, 191, 1217, 2467, 47387.
MATHEMATICA
MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]];
Select[Range[0, 50000], PrimeQ[MultiFactorial[#, 12] + 2] &]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert Price, Mar 11 2017
EXTENSIONS
a(40)-a(43) from Robert Price, Mar 24 2017
STATUS
approved