Numbers k such that the k-th triangular number contains only digits {0,2,8}.

A119056

Numbers k such that the k-th triangular number contains only digits {0,2,8}.

Terms

    a(0) =7a(1) =40a(2) =64a(3) =400a(4) =632a(5) =1287a(6) =4000a(7) =40000a(8) =126712a(9) =209775a(10) =400000a(11) =646232a(12) =663367a(13) =4000000a(14) =40000000a(15) =75897600a(16) =213645607a(17) =400000000a(18) =4000000000a(19) =12713841912a(20) =40000000000a(21) =400000000000a(22) =749506541784

External references