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 A134441 #16 Nov 21 2013 12:49:08 %S A134441 1,9,13,17,21,29,33,37,41,49,53,57,61,69,73,77,81,89,93,97 %N A134441 Last two digits of primes of form 4n+1 (A002144), excluding 5. Leading 0's omitted. %t A134441 Select[Union[Mod[#,100]&/@Select[4Range[200]+1,PrimeQ]], #!=5&] (* _Harvey P. Dale_, Apr 02 2011 *) %Y A134441 Cf. A002144. %K A134441 fini,full,nonn,base %O A134441 1,2 %A A134441 _Lekraj Beedassy_, Jan 19 2008