Numbers k such that k = T(x) + T(y) where T(m) is the m-th triangular number and k is concatenate(x, y) in base 10.

A113796

Numbers k such that k = T(x) + T(y) where T(m) is the m-th triangular number and k is concatenate(x, y) in base 10.

Terms

    a(0) =190a(1) =191a(2) =19900a(3) =19901a(4) =90415a(5) =585910a(6) =1201545a(7) =1414910a(8) =1501726a(9) =1909415a(10) =1999000a(11) =1999001a(12) =2442196a(13) =7003676a(14) =7693846a(15) =14745226a(16) =28296970a(17) =30307171a(18) =42009156a(19) =47748526a(20) =61549231a(21) =63249300a(22) =78049756a(23) =82749850a(24) =84559880a(25) =115449880a(26) =117259850a(27) =121959756

External references