Indices of centered heptagonal numbers (A069099) which are also hexagonal numbers (A000384).
A253715
Indices of centered heptagonal numbers (A069099) which are also hexagonal numbers (A000384).
Terms
- a(0) =1a(1) =2160a(2) =34417a(3) =139317984a(4) =2220346081
External references
- oeis: A253715