OFFSET
1,1
COMMENTS
a(3) > 107659373057 if it exists.
Primes p such that the Fermat quotient of p base 2 (A007663) is congruent to 1/2 modulo p. - Max Alekseyev, Aug 27 2023
PROG
(PARI) forprime(p=1, , if(Mod(p+2, p^2)^(p-1)==1, print1(p, ", ")))
CROSSREFS
KEYWORD
nonn,hard,more,bref
AUTHOR
Felix Fröhlich, Jul 21 2022
STATUS
approved