login
A329184
Numbers k such that k![4] - 1024 is prime, where k![4] = A007662(k) = quadruple factorial.
0
15, 19, 21, 25, 27, 33, 47, 51, 55, 85, 95, 153, 163, 187, 191, 315, 335, 363, 375, 419, 433, 669, 873, 1097, 1113, 1235, 1819, 1969, 2043, 2391, 2493, 3639, 4433, 5527, 6423, 9441, 14099, 24607, 27057, 62271, 98079
OFFSET
1,1
COMMENTS
a(42) > 10^5.
The first 5 primes associated with this sequence are: 2441, 64811, 207821, 5220101, 40882511.
LINKS
MATHEMATICA
MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]];
Select[Range[1000], (x = MultiFactorial[#, 4] - 1024; x > 0 && PrimeQ[x]) &]
CROSSREFS
Sequence in context: A348517 A224535 A225861 * A077349 A368827 A257020
KEYWORD
nonn
AUTHOR
Robert Price, Nov 07 2019
STATUS
approved