Numbers that are both centered triangular numbers (A005448) and centered hexagonal numbers (A003215).

A107118

Numbers that are both centered triangular numbers (A005448) and centered hexagonal numbers (A003215).

Terms

    a(0) =1a(1) =19a(2) =631a(3) =21421a(4) =727669a(5) =24719311a(6) =839728891a(7) =28526062969a(8) =969046412041

External references