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

A254137

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

Terms

    a(0) =1a(1) =52a(2) =629a(3) =59432a(4) =725289a(5) =68583900a(6) =836982301a(7) =79145760592a(8) =965876849489

External references