Wagstaff primes: primes of form (2^p + 1)/3.

A000979

Wagstaff primes: primes of form (2^p + 1)/3.

Terms

    a(0) =3a(1) =11a(2) =43a(3) =683a(4) =2731a(5) =43691a(6) =174763a(7) =2796203a(8) =715827883

External references