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 A176883 #3 Mar 31 2012 10:31:26 %S A176883 1,6,19,55,151,359,849,1956,4416,9861,21776,47659,103501,223362, %T A176883 479527,1024599,2180237,4622633,9769597,20587721,43272599,90739538, %U A176883 189867698,396512548,826579593,1720267980,3574753738,7417943000,15372756795,31819255488 %N A176883 Sum of distances of numbers between successive powers of 2 (beginning with 2^1) to previous numbers with same number of prime factors, repetitions included. See example. %e A176883 On (2,3,4), between the powers of 2, 3 is one number beyond previous prime 2. So the sum is 1. On (4,5,6,7,8), 5 is 2 beyond 3, 6 is 2 beyond 4, 7 is 2 beyond 5, for a sum of 2+2+2=6. On (8,9,10,11,12, 13,14,15,16), the distances are 3,1,4,4,2,4,1 for a sum of 19. And so on. %Y A176883 Cf. A176884. %K A176883 nonn %O A176883 1,2 %A A176883 _Daniel Tisdale_, Apr 27 2010 %E A176883 a(5)-a(30) from _Ray Chandler_, May 05 2010