OFFSET
1,1
COMMENTS
The PFGW program has been used to certify all the terms up to a(18), using a deterministic test which exploits the factorization of a(n) + 1. - Giovanni Resta, Jun 24 2018
LINKS
Maheswara Rao Valluri, Primes of the form p = 1 + n! Sum n, for some n ∈ N*, arXiv:1803.11461 [math.GM], 2018.
MATHEMATICA
Do[If[ PrimeQ[n(n +1)!/2 - 1], Print@ n], {n, 3000}]
PROG
(PARI) isok(n) = ispseudoprime(n(n+1)!/ 2 - 1);
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Maheswara Rao Valluri, Jun 22 2018
EXTENSIONS
a(16)-a(18) from Giovanni Resta, Jun 24 2018
STATUS
approved