Numbers k such that the k-th triangular number contains only digits {1,4,8}.

A119129

Numbers k such that the k-th triangular number contains only digits {1,4,8}.

Terms

    a(0) =1a(1) =478a(2) =1541a(3) =4866a(4) =988113a(5) =4216353a(6) =15155321a(7) =16977521a(8) =983990258a(9) =531956543121

External references