OFFSET
1,2
COMMENTS
Corresponding primes are: 17, 19, 23, 43, 71, 107, 421, 8521, 21521, 21827591, 49579091, 295540261, 42061737041, 104463111041, ...
a(36) > 50000.
Terms > 49 correspond to probable primes.
LINKS
Henri & Renaud Lifchitz, PRP Records. Search for n!6+16.
Joe McLean, Interesting Sources of Probable Primes
OpenPFGW Project, Primality Tester
EXAMPLE
11!6 + 16 = 11*5 + 16 = 71 is prime, so 11 is in the sequence.
MATHEMATICA
MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]];
Select[Range[0, 50000], PrimeQ[MultiFactorial[#, 6] + 16] &]
Select[Range[1000], PrimeQ[Times@@Range[#, 1, -6]+16]&] (* The program generates the first 24 terms of the sequence. To generate more, increase the Range constant. *)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert Price, Jun 09 2017
STATUS
approved