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 A023099 #5 Mar 30 2012 18:35:18 %S A023099 567,7188,1359,140,2574,244,778687,28,455,8136,8398,30,19950,24640, %T A023099 1183,33,828,868,925,1989,40977,35042,1421,40,41943,1408,4367,2186880, %U A023099 4830,62472,2405,95,3900,168000,382571,154,468270,2398,10005,276,649446,2408 %N A023099 a(n) is least k such that k and 7k are anagrams in base n (written in base 10). %K A023099 nonn,base %O A023099 8,1 %A A023099 _David W. Wilson_