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 A113700 #2 Mar 30 2012 17:27:47 %S A113700 2,3,50,75,122,174,183,194,203,291,338,410,507,615,722,794,842,914, %T A113700 1058,1082,1083,1154,1182,1191,1202,1263,1346,1371,1379,1442,1562, %U A113700 1572,1587,1623,1682,1703,1731,1778,1803,1922,2018,2019,2066,2163,2343,2354,2426 %N A113700 Members of 2-cycles of permutation A111273. %C A113700 Trajectory of n under map k -> A111273(k) is periodic with period length 2. %C A113700 n = A111273(A111273(n)) and n <> A111273(n). %C A113700 Apparently A111273 has infinitely many 2-cycles. %e A113700 A111273(122) = 183 and A111273(183) = 122, hence 122 and 183 are in the %e A113700 sequence. %Y A113700 Cf. A111273, A113659, A113701. %K A113700 nonn %O A113700 1,1 %A A113700 _Klaus Brockhaus_, Nov 08 2005