OFFSET
1,1
COMMENTS
Corresponding primes are: 29, 31, 43, 67, 251, 4507, 14107, 116507, 3727387, 536166427, ...
a(30) > 50000.
Terms > 40 correspond to probable primes.
LINKS
Henri & Renaud Lifchitz, PRP Records. Search for n!6+27.
Joe McLean, Interesting Sources of Probable Primes
OpenPFGW Project, Primality Tester
EXAMPLE
10!6 + 27 = 10*4 + 27 = 67 is prime, so 10 is in the sequence.
MATHEMATICA
MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]];
Select[Range[0, 50000], PrimeQ[MultiFactorial[#, 6] + 27] &]
Select[Range[48000], PrimeQ[Times@@Range[#, 1, -6]+27]&] (* Harvey P. Dale, Aug 10 2021 *)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert Price, Jun 09 2017
STATUS
approved