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 A187898 #4 Mar 30 2012 18:57:19 %S A187898 4,7,9,14,17,23,27,31,33,37,41,45,49,53,55,59,62,66,70,73,78,80,83,89, %T A187898 93,97,99,105,107,110,116,118,122,126,130,132,138,140,144,148,154,156, %U A187898 159,164,168,172,176,178,184,186,190,194,197,203,205,209,211,217,222,225,230,232,235,239,242,246,250,252 %N A187898 Complement of A187897. %C A187898 See A187224. %t A187898 (See A187897.) %Y A187898 Cf. A187224, A187897, A187896. %K A187898 nonn %O A187898 1,1 %A A187898 _Clark Kimberling_, Mar 15 2011