Indices of centered heptagonal numbers (A069099) which are also pentagonal numbers (A000326).
A254653
Indices of centered heptagonal numbers (A069099) which are also pentagonal numbers (A000326).
Terms
- a(0) =1a(1) =3a(2) =58a(3) =276a(4) =6325a(5) =30303a(6) =695638a(7) =3333000a(8) =76513801a(9) =366599643a(10) =8415822418a(11) =40322627676a(12) =925663952125
External references
- oeis: A254653