Indices of triangular numbers which are also heptagonal.

A039835

Indices of triangular numbers which are also heptagonal.

Terms

    a(0) =1a(1) =10a(2) =493a(3) =3382a(4) =158905a(5) =1089154a(6) =51167077a(7) =350704366a(8) =16475640049a(9) =112925716858

External references