Indices of heptagonal numbers that are also decagonal.
A203409
Indices of heptagonal numbers that are also decagonal.
Terms
- a(0) =1a(1) =15a(2) =1075a(3) =21201a(4) =1549717a(5) =30571395a(6) =2234690407a(7) =44083929957
External references
- oeis: A203409