OFFSET
1,1
COMMENTS
Corresponding primes are: 37, 53, 263, 617, 65867, 208877, 5221157, 40883567, ...
a(50) > 10^5.
Terms > 37 correspond to probable primes.
LINKS
Henri & Renaud Lifchitz, PRP Records. Search for n!4+32.
Joe McLean, Interesting Sources of Probable Primes
OpenPFGW Project, Primality Tester
EXAMPLE
13!4 + 2^5 = 13*9*5*1 + 32 = 617 is prime, so 13 is in the sequence.
MATHEMATICA
MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]];
Select[Range[0, 50000], PrimeQ[MultiFactorial[#, 4] + 2^5] &]
Select[Range[82000], PrimeQ[Times@@Range[#, 1, -4]+32]&] (* Harvey P. Dale, Apr 11 2022 *)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert Price, Aug 22 2017
EXTENSIONS
a(47)-a(49) from Robert Price, Sep 25 2019
STATUS
approved