A048827 a(n) = least k such that A047988(k) = n.
2, 3, 19, 173, 3976733
Offset: 0
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Definition corrected by R. J. Mathar, Jun 26 2007
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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