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 A374830 #9 Aug 20 2024 01:53:14
%S A374830 4,5,5,6,9,0,0,9,8,7,8,4,6,0,4,4,8,4,7,8,9,1,7,2,5,9,5,4,7,3,4,6,9,3,
%T A374830 7,8,2,3,4,4,4,1,9,1,8,5,9,7,5,7,5,1,1,5,3,6,1,3,8,6,9,0,5,6,4,8,0,7,
%U A374830 8,3,9,5,4,7,0,4,9,0,9,6,7,1,0,4,7,6,2,6,3,3,0,0,0,1,0,6,3,8,2,6
%N A374830 Decimal expansion of 17*(5 - 3*A136141)/100.
%C A374830 Lower bound of Product_{p prime} (1 - (1/(p*(p - 1)))*p^2/(p^2 + 1)) = A374831.
%H A374830 Rafael Jakimczuk, <a href="https://www.researchgate.net/publication/382207808_Numbers_of_the_form_p-1_where_p_is_prime">Numbers of the form p-1 where p is prime</a>, July 2024. See pp. 23-24.
%F A374830 Equals (3/5)*(17/20)*(1 - (A136141 - (1/2 + 1/6))) (see Jakimczuk).
%F A374830 Equals (125/153)*A374829.
%e A374830 0.45569009878460448478917259547346937823444191859757511536...
%o A374830 (PARI) 17*(5 - 3*sumeulerrat(1/(p*(p-1))))/100 \\ _Amiram Eldar_, Aug 20 2024
%Y A374830 Cf. A136141, A374829, A374831.
%K A374830 nonn,cons
%O A374830 0,1
%A A374830 _Stefano Spezia_, Jul 21 2024