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.
%I A103117 #17 Aug 13 2020 14:01:06 %S A103117 3871,7777,9911,9921,9922,9931,9933,9941,9951,9955,9961,9966,9971, %T A103117 9977,9981,9988,9999,66642,66651,66661,66666,66678,66681,66691 %N A103117 Berend Jan van der Zwaag's conjectured complete list of numbers that start different "expanding periodic loops" under the mapping described in A053392 and A060630. %C A103117 See link for the precise definition. %H A103117 Lars Blomberg, <a href="/A103117/a103117.txt">All 160 members of all expanding cycles</a> %H A103117 Erich Friedman, <a href="https://erich-friedman.github.io/mathmagic/0200.html">Problem of the Month (Feb 2000)</a> %Y A103117 Cf. A053392, A060630. %K A103117 base,nonn,fini,full %O A103117 1,1 %A A103117 _N. J. A. Sloane_, Sep 06 2008 %E A103117 9966 inserted by _Lars Blomberg_, Aug 26 2011