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 A178610 #3 Mar 30 2012 18:52:41 %S A178610 4,5,9,8,11,14,19,18,25,21,30,28,34,31,35,38,49,46,53,51,49,52,62,62, %T A178610 63,76,70,81,73,79,89,84,80,90,91,101,109,102,116,121,105,112,117,129, %U A178610 116,128,123,142,138,126,147,137,145,156,144,169,162,155,167,176,185,170 %N A178610 n-th semiprime minus difference between the prime indices of the two factors of n-th semiprime. %F A178610 a(n)=A001358(n)-A176506(n). %K A178610 nonn %O A178610 1,1 %A A178610 _Juri-Stepan Gerasimov_, May 30 2010 %E A178610 Corrected (153 replaced by 155) by _R. J. Mathar_, May 31 2010