Values of n such that the sum of the 7-gonal number (5*n^2 - 3*n)/2 and the following 7-gonal number is a 7-gonal number.
A133328
Values of n such that the sum of the 7-gonal number (5*n^2 - 3*n)/2 and the following 7-gonal number is a 7-gonal number.
Terms
- a(0) =0a(1) =170a(2) =13622a(3) =6672192a(4) =534017484a(5) =261563278454
External references
- oeis: A133328