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 A176884 #3 Mar 31 2012 10:31:26 %S A176884 0,1,0,2,2,2,0,3,1,4,4,2,4,1,0,4,6,2,2,6,1,4,8,3,1,7,1,6,2,2,0,7,1,1, %T A176884 12,6,3,1,4,4,12,2,2,1,7,4,16,3,5,2,2,6,14,4,2,2,1,6,4,2,4,11,0,3,3,6, %U A176884 2,4,2,4,24,2,5,5,1,3,2,6,8,21,5,4,3,3,1,1,4,6,2,4,14,2,1,1,32,8,6,1,10,4,3 %N A176884 Beginning with 2, the distance between a number and the previous number with same number of prime factors, repetitions included. Powers of 2 are assigned zero. See example. %e A176884 The distance between numbers and previous number with same number of primes (#,d): (2,0),(3,1),(4,0),(5,2),(6,2),(7,2),(8,0),(9,3),...So the sequence is: 0,1,0,2,2,2,0,3,... %Y A176884 Cf. A176883. %K A176884 nonn %O A176884 1,4 %A A176884 _Daniel Tisdale_, Apr 27 2010 %E A176884 Extended by _Ray Chandler_, May 05 2010