Indices of centered triangular numbers (A005448) which are also octagonal numbers (A000567).

A253822

Indices of centered triangular numbers (A005448) which are also octagonal numbers (A000567).

Terms

    a(0) =1a(1) =256a(2) =833a(3) =294848a(4) =960705a(5) =340253760a(6) =1108652161a(7) =392652543616

External references