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 A111904 #7 May 29 2017 13:46:06 %S A111904 0,0,1,1,5,12,59,107,269,641,1457,3553 %N A111904 Number of unitary amicable pairs in which the smallest member has n digits. %H A111904 J. O. M. Pedersen, <a href="http://amicable.homepage.dk/knwnunap.htm">Known Unitary Amicable Pairs</a> %H A111904 J. O. M. Pedersen, <a href="http://amicable.homepage.dk/tables.htm">Tables of Aliquot Cycles</a> [Broken link] %H A111904 J. O. M. Pedersen, <a href="http://web.archive.org/web/20140502102524/http://amicable.homepage.dk/tables.htm">Tables of Aliquot Cycles</a> [Via Internet Archive Wayback-Machine] %H A111904 J. O. M. Pedersen, <a href="/A063990/a063990.pdf">Tables of Aliquot Cycles</a> [Cached copy, pdf file only] %Y A111904 Cf. A002952, A002953. %K A111904 nonn,base %O A111904 1,5 %A A111904 _N. J. A. Sloane_, Nov 24 2005 %E A111904 The next term, a(13), is at least 6664.