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 A174520 #2 Mar 31 2012 12:38:31
%S A174520 4,10,33,39,57,63,81,193,160,200,287,159,177,385,530,340,380,527,279,
%T A174520 452,623,673,1081,948,399,417,423,441,1893,1947,1057,808,1434,1446,
%U A174520 920,1570,1295,1345,1730,1060,1854,1866,777,783,2453,4642,3062,903,921,1873
%N A174520 Sum of all composite numbers in-between prime numbers p(n) and p(n+2).
%C A174520 2_3_4_5 -> 4, 3_4_5_6_7 -> 4+6=10, 5_6_7_8_9_10_11 -> 6+8+9+10=33, ..
%t A174520 f[n_,x_]:=n*x+x*(x+1)/2;Table[f[Prime[n],Prime[n+2]-Prime[n]-1]-Prime[n+1],{n,5!}]
%Y A174520 Cf. A034962, A054265, A174518, A174519
%K A174520 nonn
%O A174520 1,1
%A A174520 _Vladimir Joseph Stephan Orlovsky_, Mar 21 2010