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 A205648 #18 Aug 19 2013 03:55:18 %S A205648 338,2543,91668,170596,420297,33909384 %N A205648 Self-locating strings within e: numbers n such that the string n is at position n (after the decimal point) in decimal digits of e. %C A205648 a(7) is greater than 10^9. %C A205648 Heuristically (assuming e is 10-normal and in the absence of any 'conspiracy' amongst the digits) about 1 - exp(-0.9) = 59.3...% of the time there is some d-digit number in this sequence, and a(n) is on the order of 12.9...^(n + o(1)). [_Charles R Greathouse IV_, Mar 16 2012] %H A205648 Jingwei Liu and Yongzhi Pan, <a href="https://github.com/th507/Slopi">Slopi</a> %o A205648 (C) See Liu & Pan link. %Y A205648 Cf. A001113. %Y A205648 Similar to A057680 (self-locating strings within Pi). %K A205648 nonn,base,more %O A205648 1,1 %A A205648 _Jingwei Liu_, Jan 30 2012