Indices of 9-gonal numbers which are also triangular.
A048907
Indices of 9-gonal numbers which are also triangular.
Terms
- a(0) =1a(1) =10a(2) =154a(3) =2449a(4) =39025a(5) =621946a(6) =9912106a(7) =157971745a(8) =2517635809a(9) =40124201194a(10) =639469583290
External references
- oeis: A048907