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 A120833 #4 Mar 30 2012 18:50:54 %S A120833 1,11,37,359,4211,21569,26861,404633,486533,543317,620537,12904043, %T A120833 14719493,15845813,34726021,185083001,206868401,222740621,61034249, %U A120833 715725589,23180285059,24177226459,8697796903,9167200453,9502812653 %N A120833 Numerators of partial sums of (p+q)/p*q, where p and q are primes. %C A120833 Denominators: A120834(n); %C A120833 a(n)/A120834(n) = Sum(A001358(n)/A068318(n):1<=k<=n). %e A120833 n=5: 2*2/(2+2)+2*3/(2+3)+3*3/(3+3)+2*5/(2+5)+2*7/(2+7) = %e A120833 4/4 + 6/5 + 9/6 + 10/7 + 14/9 = 4211/630 = a(5)/A120834(5). %Y A120833 Cf. A120836, A120831. %K A120833 nonn,frac %O A120833 1,2 %A A120833 _Reinhard Zumkeller_, Jul 24 2006