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 A191773 #4 Mar 30 2012 18:57:33 %S A191773 3,8,15,17,25,27,38,40,43,53,55,57,62,75,77,80,86,89,101,102,105,110, %T A191773 117,120,134,135,140,145,154,157,158,167,175,176,181,183,188,201,204, %U A191773 205,215,224,225,232,235,239,242,251,256,260,261,263,274,283,286,287 %N A191773 Positions of 3 in A191770. %C A191773 See A191770. %t A191773 (See A191770.) %Y A191773 Cf. A191770, A191771, A191772. %K A191773 nonn %O A191773 1,1 %A A191773 _Clark Kimberling_, Jun 16 2011