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

A251730

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

Terms

    a(0) =10a(1) =152a(2) =2130a(3) =29680a(4) =413402a(5) =5757960a(6) =80198050a(7) =1117014752a(8) =15558008490a(9) =216695104120

External references