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 A084335 #7 Aug 25 2014 12:19:04 %S A084335 4,6,9,8,12,18,10,15,22,32,14,25,16,28,42,20,33,48,21,38,54,24,44,63, %T A084335 26,49,70,27,51,76,30,56,84,34,65,36,68,35,69,104,39,75,114,40,78,118, %U A084335 45,86,128,46,90,135,50,98,145,52,105,154,55,106,158,57,111,166,58,115 %N A084335 a(1) = 1; a(n+1) is the least composite number m not already used such that |m-a(n)| is not equal to |a(k+1)-a(k)| for any k < n. %Y A084335 Cf. A081145, A084331, A084334. %K A084335 nonn,easy %O A084335 1,1 %A A084335 _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jun 18 2003 %E A084335 Edited and extended by _David Wasserman_, Dec 15 2004