Indices of pentagonal numbers (A000326) which are also centered heptagonal numbers (A069099).
A254652
Indices of pentagonal numbers (A000326) which are also centered heptagonal numbers (A069099).
Terms
- a(0) =1a(1) =4a(2) =88a(3) =421a(4) =9661a(5) =46288a(6) =1062604a(7) =5091241a(8) =116876761a(9) =559990204a(10) =12855381088a(11) =61593831181
External references
- oeis: A254652