Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to the sum of the octagonal numbers N(m) and N(m+1) for some m.

A251793

Numbers n such that the sum of the triangular numbers T(n) and T(n+1) is equal to the sum of the octagonal numbers N(m) and N(m+1) for some m.

Terms

    a(0) =0a(1) =2a(2) =68a(3) =286a(4) =6760a(5) =28122a(6) =662508a(7) =2755766a(8) =64919120a(9) =270037042a(10) =6361411348a(11) =26460874446a(12) =623353393080

External references