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 A165448 #4 Jul 20 2019 10:13:19
%S A165448 2,3,35,143,6678671,584803025179,34227405074603836560875299,
%T A165448 16008643688606125328574585946049488062084747136988251,
%U A165448 497369008478585535856296246658391242478488212329477774761792556414828431057586895468763959997722781406315137061
%N A165448 Product of prime numbers between 2^n+1 and 2^(n+1), inclusive.
%C A165448 a(1)+1, a(2)+1 and a(3)+1 are squares.
%t A165448 Table[Times@@Prime[Range[PrimePi[2^n]+1,PrimePi[2^(n+1)]]],{n,0,8}] (* _Harvey P. Dale_, Jul 20 2019 *)
%o A165448 (PARI) a(n)=prod(i=2^n+1,2^(n+1),if(isprime(i),i,1))
%Y A165448 Cf. A000040, A000079, A157625.
%K A165448 nonn
%O A165448 0,1
%A A165448 _Jaume Oliver Lafont_, Sep 20 2009