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 A120832 #4 Mar 30 2012 18:50:54 %S A120832 1,6,2,5,70,210,210,1155,1155,30030,10010,85085,17017,646646,1939938, %T A120832 22309287,22309287,22309287,111546435,37182145,2156564410,33426748355, %U A120832 33426748355,100280245065,7420738134810,7420738134810 %N A120832 Denominators of partial sums of (p+q)/p*q, where p and q are primes. %C A120832 Numerators: A120831(n); %C A120832 A120831(n)/a(n) = Sum(A068318(n)/A001358(n):1<=k<=n). %e A120832 n=5: (2+2)/2*2+(2+3)/2*3+(3+3)/3*3+(2+5)/2*5+(2+7)/2*7 = %e A120832 4/4 + 5/6 + 6/9 + 7/10 + 9/14 = 269/70 = A120831(5)/a(5). %Y A120832 Cf. A120835, A120834. %K A120832 nonn,frac %O A120832 1,2 %A A120832 _Reinhard Zumkeller_, Jul 24 2006