Indices of hexagonal numbers (A000384) which are also centered hexagonal numbers (A003215).

A253175

Indices of hexagonal numbers (A000384) which are also centered hexagonal numbers (A003215).

Terms

    a(0) =1a(1) =7a(2) =67a(3) =661a(4) =6541a(5) =64747a(6) =640927a(7) =6344521a(8) =62804281a(9) =621698287a(10) =6154178587a(11) =60920087581a(12) =603046697221

External references