Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to a heptagonal number H(m) for some m.
A251927
Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to a heptagonal number H(m) for some m.
Terms
- a(0) =0a(1) =8a(2) =76a(3) =1518a(4) =12986a(5) =111034a(6) =2190396a(7) =18727244a(8) =160112392a(9) =3158550954a(10) =27004674302a(11) =230881959670
External references
- oeis: A251927