Indices of pentagonal numbers (A000326) that are also squares (A000290).

A046172

Indices of pentagonal numbers (A000326) that are also squares (A000290).

Terms

    a(0) =1a(1) =81a(2) =7921a(3) =776161a(4) =76055841a(5) =7452696241a(6) =730288175761

External references