Indices of centered octagonal numbers (A016754) which are also centered pentagonal numbers (A005891).

A253411

Indices of centered octagonal numbers (A016754) which are also centered pentagonal numbers (A005891).

Terms

    a(0) =1a(1) =76a(2) =646a(3) =108871a(4) =930811a(5) =156991186a(6) =1342228096a(7) =226381180621

External references