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A284310
Numbers k such that k![14] + 2 is prime, where k![14] is the fourteen-fold multifactorial.
2
0, 1, 3, 5, 9, 11, 15, 17, 19, 21, 25, 27, 31, 33, 35, 45, 47, 67, 73, 87, 101, 107, 125, 153, 161, 179, 193, 229, 237, 247, 255, 277, 307, 333, 475, 495, 795, 799, 859, 861, 875, 915, 1023, 1077, 1115, 1175, 1221, 1227, 1245, 1345, 1687, 1923, 2337, 2595
OFFSET
1,3
COMMENTS
a(108) > 10^5.
The first 17 primes associated with this sequence: 3, 3, 5, 7, 11, 13, 17, 53, 97, 149, 277, 353, 1583, 3137, 5147, 71147, 147347.
k![14](0..20) = 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 32, 51, 72, 95, 120.
LINKS
MATHEMATICA
MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]];
Select[Range[0, 100000], PrimeQ[MultiFactorial[#, 14] + 2] &]
CROSSREFS
Cf. A284190.
Sequence in context: A178442 A319986 A359408 * A109324 A356935 A190844
KEYWORD
nonn
AUTHOR
Robert Price, Mar 24 2017
STATUS
approved