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 A048824 #9 Oct 19 2017 03:13:49 %S A048824 2,3,7,23,347,1439,10780559 %N A048824 a(n) = least k such that A048823(n) = k. %C A048824 a(6) > 1000000. %C A048824 a(7) > 10^8, if it exists. - _Don Reble_, Apr 02 2002 %K A048824 nonn %O A048824 0,1 %A A048824 _Christian G. Bower_, May 15 1999 %E A048824 More terms from _Don Reble_, Apr 02 2002