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 A204989 #5 Mar 30 2012 18:58:09 %S A204989 4,4,8,8,32,8,16,16,128,32,2048,16,8192,16,32,32,512,128,524288,64, %T A204989 128,2048,4096,32,2097152,8192,524288,32,536870912,32,64,64,2048,512, %U A204989 8192,256,137438953472,524288,8192,128,2097152,128,32768,4096 %N A204989 Least 2^k such that n divides 2^k-2^j for some j<k. %C A204989 For a guide to related sequences, see A204892. %t A204989 (See the program at A204987.) %Y A204989 Cf. A204892, A204987. %K A204989 nonn %O A204989 1,1 %A A204989 _Clark Kimberling_, Jan 21 2012