OFFSET
1,1
COMMENTS
Corresponding primes are: 1069, 1609, 1515229, 40884559, 4996617649, ...
a(37) > 10^5.
Terms > 33 correspond to probable primes.
LINKS
Henri & Renaud Lifchitz, PRP Records. Search for n!4+1024.
Joe McLean, Interesting Sources of Probable Primes
OpenPFGW Project, Primality Tester
EXAMPLE
13!4 + 2^10 = 13*9*5*1 + 1024 = 1609 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] + 2^10] &]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Robert Price, Aug 22 2017
EXTENSIONS
a(36)-a(37) from Robert Price, Sep 25 2019
STATUS
approved