Primes p such that (2^p+1)^(p-1) == 1 (mod p^2).A260507Primes p such that (2^p+1)^(p-1) == 1 (mod p^2).Terms a(0) =2a(1) =7a(2) =179a(3) =619a(4) =17807External referencesoeis: A260507