Numbers k such that triangular numbers T(k) and T(k+1) sum to another triangular number (that is also a perfect square).

A076708

Numbers k such that triangular numbers T(k) and T(k+1) sum to another triangular number (that is also a perfect square).

Terms

    a(0) =0a(1) =5a(2) =34a(3) =203a(4) =1188a(5) =6929a(6) =40390a(7) =235415a(8) =1372104a(9) =7997213a(10) =46611178a(11) =271669859a(12) =1583407980a(13) =9228778025a(14) =53789260174a(15) =313506783023

External references