Numbers k such that the k-th triangular number contains only digits {0,3,9}.

A119070

Numbers k such that the k-th triangular number contains only digits {0,3,9}.

Terms

    a(0) =2a(1) =24a(2) =42a(3) =44a(4) =77a(5) =260a(6) =282a(7) =824a(8) =1364a(9) =8835a(10) =44517a(11) =88419a(12) =89375a(13) =256917a(14) =282842a(15) =426600a(16) =2603844a(17) =14141435a(18) =424287482a(19) =894359435a(20) =24629287602a(21) =81351102024a(22) =137064943244

External references