Numbers k such that the k-th triangular number contains only digits {2,4,5}.

A119159

Numbers k such that the k-th triangular number contains only digits {2,4,5}.

Terms

    a(0) =9a(1) =10a(2) =225a(3) =714a(4) =6714a(5) =22114a(6) =2119209a(7) =2211449a(8) =102523609a(9) =942573334a(10) =95336514049

External references