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 A270896 #5 Mar 29 2016 22:39:58 %S A270896 134959,2245939,2468549,2505707,4233101,7248203,7514681,8524057, %T A270896 10379689,11105999,11701529,13050139,14535919,17224783,17918117, %U A270896 20887471,22609447,23352049,26616221,29156453,29583953,29913997,31273301,32046613,35672821,35882309 %N A270896 Values of n for which n^2 is a Sierpiński number. %H A270896 Wikipedia, <a href="http://en.wikipedia.org/wiki/Sierpinski_number">Sierpinski number</a> %F A270896 a(n) = sqrt(A270895(n)). %Y A270896 Cf. A076336, A233469, A270895. %K A270896 nonn %O A270896 1,1 %A A270896 _Arkadiusz Wesolowski_, Mar 25 2016