Indices of the centered 12-gonal numbers which are also 12-gonal number, or numbers X such that 120*X^2-120*X+36 is a square.
A133285
Indices of the centered 12-gonal numbers which are also 12-gonal number, or numbers X such that 120*X^2-120*X+36 is a square.
Terms
- a(0) =1a(1) =12a(2) =253a(3) =5544a(4) =121705a(5) =2671956a(6) =58661317a(7) =1287877008a(8) =28274632849a(9) =620754045660
External references
- oeis: A133285