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 A334746 #31 Feb 16 2025 08:34:00
%S A334746 1,4,16,144,3600,1800,57600,518400,62726400,3073593600,614718720,
%T A334746 614718720,3073593600,3073593600,1625931014400,274782341433600,
%U A334746 231091949145657600,231091949145657600,231091949145657600,231091949145657600,77030649715219200
%N A334746 Denominator of Sum_{k=1..n} 1/(prime(k) - 1)^2.
%C A334746 Lim_{n -> infinity} A119686(n)/a(n) = A086242.
%H A334746 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PrimeSums.html">Prime Sums</a>.
%e A334746 The first few fractions are 1, 5/4, 21/16, 193/144, 4861/3600, 2443/1800, 78401/57600, 707209/518400, ... = A119686/A334746.
%t A334746 Denominator @ Accumulate @ Table[1/(Prime[k] - 1)^2, {k, 1, 21}] (* _Amiram Eldar_, May 12 2020 *)
%o A334746 (PARI) a(n) = denominator(sum(k=1, n, 1/(prime(k) - 1)^2)); \\ _Michel Marcus_, May 12 2020
%Y A334746 Cf. A000040, A006093, A086242, A119686 (numerators).
%K A334746 nonn,frac
%O A334746 1,2
%A A334746 _Petros Hadjicostas_, May 11 2020