Indices of centered 10-gonal numbers (A062786) that are also triangular numbers (A000217).

A280112

Indices of centered 10-gonal numbers (A062786) that are also triangular numbers (A000217).

Terms

    a(0) =1a(1) =19a(2) =703a(3) =26677a(4) =1013005a(5) =38467495a(6) =1460751787a(7) =55470100393

External references