A053913 Squares composed of digits {1,7,8}.
1, 81, 11881, 78881777881, 11187111187877881, 77878887787187881
Offset: 1
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Crossrefs
Cf. A053912.
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.