Primes of the form Sum[7^i, {i, 0, n}] + 1 - Mod[Sum[7^i, {i, 0, n}], 2].

A102324

Primes of the form Sum[7^i, {i, 0, n}] + 1 - Mod[Sum[7^i, {i, 0, n}], 2].

Terms

    a(0) =401a(1) =2801a(2) =19609a(3) =2306881201a(4) =16148168401

External references