Indices of pentagonal numbers (A000326) which are also centered hexagonal numbers (A003215).

A254136

Indices of pentagonal numbers (A000326) which are also centered hexagonal numbers (A003215).

Terms

    a(0) =1a(1) =73a(2) =889a(3) =84049a(4) =1025713a(5) =96992281a(6) =1183671721a(7) =111929008033

External references