Numbers n such that n^2 + (n+1)^2 + (n+2)^2 is equal to the sum of the heptagonal numbers H(m), H(m+1) and H(m+2) for some m.

A251770

Numbers n such that n^2 + (n+1)^2 + (n+2)^2 is equal to the sum of the heptagonal numbers H(m), H(m+1) and H(m+2) for some m.

Terms

    a(0) =27a(1) =378a(2) =40365a(3) =546516a(4) =58207743a(5) =788077134a(6) =83935526481

External references