A154998 Primes p such that p^2 divides A048861((p-1)/2).

3, 2001907169

Offset: 1

Author

Max Alekseyev, Jan 18 2009

Keywords

• bref
• hard
• more
• nonn

Comments

No other terms below 10^11.

Crossrefs

A048861,A121999,A125854

Programs

PARI

{ forprime(p=3,10^11, if(Mod((p-1)/2,p^2)^((p-1)/2)==1, print(p);)) }

Formula

Elements of A125854 congruent to 1 or 3 modulo 8, i.e., primes p such that p == 1 or 3 (mod 8) and 2^(p-1) == 1+p (mod p^2).

Extensions

Edited by Max Alekseyev, Oct 13 2009