A119211 Numbers k such that the k-th triangular number contains only digits {4,6,7}.
3, 11, 36, 976, 1236, 3048, 964131, 36536961224668, 123828734689848, 299247973315331
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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