Indices of heptagonal numbers (A000566) which are also pentagonal.
A046198
Indices of heptagonal numbers (A000566) which are also pentagonal.
Terms
- a(0) =1a(1) =42a(2) =2585a(3) =160210a(4) =9930417a(5) =615525626a(6) =38152658377
External references
- oeis: A046198