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 A165659 #4 Jul 17 2015 11:07:45 %S A165659 2,5,5,17,28,41,58,77,50,129,16,197,119,281,164,127,440,501,568,71, %T A165659 356,791,46,321,530,1161,1264,457,1480,1593,344,1851,284,2127,2276, %U A165659 809,2584,2747,1457,441,1633,1149,3638,3831,1007,4227,4438 %N A165659 Numerators of A007504 divided by A033955, starting from the second term of A033955. %C A165659 Conjecture: with the exception of the second term, 2 <= a(n)/A165660(n) < 3. %o A165659 (PARI) a1(n)=sum(i=1, n, prime(i)); %o A165659 b1(n)=sum(i=1, n, prime(n+1)%prime(i)); %o A165659 a(n)=if(n<0, 0, numerator(a1(n)/b1(n))); %o A165659 for(n=1, 50, print1(a(n) ", ")) %Y A165659 Cf. A007504, A033995, A002110, A102647, A165657, A165658, A165660. %K A165659 easy,nonn %O A165659 1,1 %A A165659 _Creighton Dement_, Sep 24 2009 %E A165659 Typo in definition corrected by _Creighton Dement_, Oct 09 2009