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 A084053 #9 Aug 21 2014 14:46:00 %S A084053 1,1,2,2,2,3,3,0,0,0,1,1,2,2,2,3,3,0,0,0,1,1,1,1,1,3,3,1,1,1,3,3,1,1, %T A084053 1,3,3,1,1,1,3,3,1,1,1,3,3,2,2,2,0,0,2,2,2,0,0,2,2,2,0,0,2,2,2,0,0,2, %U A084053 2,2,0,0,3,3,3,1,1,3,3,3,1,1,3,3,3,1,1,3,3,3,1,1,3,3,3,1,1,0,0,0,2,2,0,0,0 %N A084053 4*n digit-reversed mod 4. %e A084053 a(23) =1 as, 23*4 = 92,digit-reversed = 29 ==1 (mod 4) %t A084053 Mod[#,4]&/@(FromDigits[Reverse[IntegerDigits[#]]]&/@ (4Range[3,110])) (* _Harvey P. Dale_, Sep 30 2011 *) %Y A084053 Cf. A084052, A084054, A084055, A084339, A084340, A084341. %K A084053 base,easy,nonn %O A084053 3,3 %A A084053 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 26 2003 %E A084053 More terms from _Ray Chandler_, May 27 2003