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 A178045 #4 Mar 30 2012 18:52:40 %S A178045 0,2,2,2,0,0,2,2,0,0,3,2,0,0,1,1,1,0,1,2,1,1,0,1,0,1,1,0,1,3,0,1,3,0, %T A178045 0,0,0,1,0,1,0,1,2,3,0,0,1,0,2,0,0,3,2,0,0,0,1,2,1,0,1,1,0,0,0,2,0,1, %U A178045 1,1,0,0,1,0,0,3,2,1,0,3,3,1,0,1,0,0,0,1,1,0,0,0,0,1,1,0,2,0,1,1,1,1,0,0,1 %N A178045 Numbers of semiprimes between consecutive even numbers that are not semiprimes. %C A178045 Numbers of semiprimes between A176100(n) and A176100(n+1) where A176100 is twice the n-th nonprime numbers. %e A178045 a(1)=0 because 2*A141468(1)=0<2=2*A141468(2); a(2)=2 because 2*A141468(2)=2<4(semiprime)<6(semiprime)<8=2*A141468(3). %Y A178045 Cf. A001358, A141468, A176851. %K A178045 nonn %O A178045 1,2 %A A178045 _Juri-Stepan Gerasimov_, May 18 2010 %E A178045 a(66) and a(67) corrected by _R. J. Mathar_, May 28 2010