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 A075160 #5 May 01 2014 02:44:54 %S A075160 1,2,3,4,6,5,11,8,7,12,22,9,43,21,10,16,86,13,171,24,23,44,342,17,14, %T A075160 85,15,41,683,20,1366,32,42,172,19,25,2731,341,87,48,5462,45,10923,88, %U A075160 18,684,21846,33,27,28,170,169,43691,29,46,81,343,1365,87382,40,174763 %N A075160 Prime factorization of n encoded with the run lengths of binary expansion + 1. %C A075160 See the comment at A075158. %H A075160 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A075160 a(9) = 7 = 1+6 (1 + 110) as 9 = 3^2 * 2^(1-1). (The run lengths of 6, 110 in binary are 2 and 1). %Y A075160 Inverse of A075159. a(n) = A075158(n-1)+1. %K A075160 nonn %O A075160 1,2 %A A075160 _Antti Karttunen_, Sep 13 2002