A119227 Numbers k such that the k-th triangular number contains only digits {5,7,9}.
10, 34, 109, 3944509, 4421714, 10730871349, 12472189525, 3893060383753634
Offset: 1
Links
- G. Resta, Tridigital Triangular Numbers
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
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