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 A062447 #27 Aug 11 2023 09:59:33 %S A062447 2,3,13,113,1291,20443,350741,7535917,173723909,4735396021, %T A062447 160158887507,5681909839321,237981875869277,10922592672383377, %U A062447 520256404164231967,26879210482658444513,1556951523272630146229 %N A062447 a(n) = prime(q(n)), where q(n) = A002110(n). %F A062447 a(n) = A000040(A002110(n)). %e A062447 q(11) = 2*3*5*7*11*13*17*19*23*29*31 = 200560490130 and the 200560490130th prime is 5681909839321. %t A062447 Prime[FoldList[Times, 1, Prime@ Range[10]]] (* _Michael De Vlieger_, Aug 10 2023 *) %o A062447 (PARI) a(n) = prime(vecprod(primes(n))); \\ _Michel Marcus_, Aug 11 2023 %Y A062447 Cf. A000040, A002110. %K A062447 nonn,hard,more %O A062447 0,1 %A A062447 _Labos Elemer_, Jul 09 2001 %E A062447 a(11)=q(12)=p(37#) through a(15)=q(16)=p(53#) from _Henri Lifchitz_, Nov 11 2014 %E A062447 Missing a(0)=2 inserted by _Alois P. Heinz_, Apr 01 2021