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 A036248 #25 Nov 24 2024 17:11:14 %S A036248 1,3,16,115,1281,16768,286337,5457171,125801270,3653694001, %T A036248 113390315301,4199095360138,172276300080959,7412079998841375, %U A036248 348540036245625584,18480034001016997327,1090670546096248467877,66549383345872173537824,4459899354719531875502085 %N A036248 Denominator of fraction equal to the continued fraction [ 2, 3, 5, ..., prime(n) ]. %F A036248 a(1) = 1, a(2) = 3, a(n) = A000040(n) * a(n-1) + a(n-2). - _Daniel Suteu_, Dec 20 2016 %e A036248 Prime(4) = 7, and 2+1/(3+1/(5+1/7)) = 266/115, so a(4) = 115. - _Jon E. Schoenfield_, Dec 20 2016 %o A036248 (PARI) a(n)=if(n<0,0,contfracpnqn(vector(n,i, prime(i)))[2,1]) %Y A036248 Cf. A000040, A036247. %K A036248 frac,easy,nonn %O A036248 1,2 %A A036248 _Jeff Burch_ %E A036248 More terms from _Benoit Cloitre_, May 25 2003