Numbers n such that the octagonal number O(n) is equal to the sum of the heptagonal numbers H(m) and H(m+1) for some m.

A253305

Numbers n such that the octagonal number O(n) is equal to the sum of the heptagonal numbers H(m) and H(m+1) for some m.

Terms

    a(0) =2a(1) =29a(2) =100a(3) =1777a(4) =6178a(5) =110125a(6) =382916a(7) =6825953a(8) =23734594a(9) =423098941a(10) =1471161892a(11) =26225308369a(12) =91188302690

External references