Indices of 7-gonal numbers which are also centered 7-gonal numbers.

A133271

Indices of 7-gonal numbers which are also centered 7-gonal numbers.

Terms

    a(0) =1a(1) =8a(2) =92a(3) =1093a(4) =13021a(5) =155156a(6) =1848848a(7) =22031017a(8) =262523353a(9) =3128249216a(10) =37276467236a(11) =444189357613

External references