Indices of triangular numbers which are also 9-gonal.
A048908
Indices of triangular numbers which are also 9-gonal.
Terms
- a(0) =1a(1) =25a(2) =406a(3) =6478a(4) =103249a(5) =1645513a(6) =26224966a(7) =417953950a(8) =6661038241a(9) =106158657913
External references
- oeis: A048908