Numbers k such that the k-th triangular number contains only digits {1,3,7}.

A119118

Numbers k such that the k-th triangular number contains only digits {1,3,7}.

Terms

    a(0) =1a(1) =2a(2) =18a(3) =58a(4) =1853a(5) =5853a(6) =1620578a(7) =485216058a(8) =1243473981a(9) =2747265466a(10) =595277030253a(11) =789599540493

External references