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 A203817 #23 Jan 19 2025 14:27:44
%S A203817 1,8,1,3,3,7,6,4,9,2,3,9,1,6,0,3,4,9,9,6,1,3,1,3,4,5,3,1,2,7,1,0,4,0,
%T A203817 0,1,9,1,0,7,6,6,4,1,8,1,3,7,2,6,0,0,8,0,8,6,3,6,1,4,8,0,7,8,1,9,7,5,
%U A203817 0,9,2,2,9,6,3,0,0,4,2,0,3,8,6,4,5,3,4,5,5,0,3,8,7,1,5,5,0,4,4
%N A203817 Decimal expansion of gamma*Pi.
%H A203817 G. C. Greubel, <a href="/A203817/b203817.txt">Table of n, a(n) for n = 1..10000</a>
%H A203817 Michael I. Shamos, <a href="http://euro.ecom.cmu.edu/people/faculty/mshamos/cat.pdf">A catalog of the real numbers</a>, (2007). See p. 587.
%F A203817 Equals -2 * Integral_{x=0..oo} log(x)*sin(x)/x dx. - _Amiram Eldar_, Aug 18 2020
%e A203817 1.8133764923916034996131345312710400191076641813726...
%p A203817 evalf(gamma*Pi) ;
%t A203817 RealDigits[EulerGamma*Pi, 10, 100][[1]] (* _G. C. Greubel_, Sep 06 2018 *)
%o A203817 (PARI) Euler*Pi
%o A203817 (Magma) R:= RealField(100); EulerGamma(R)*Pi(R); // _G. C. Greubel_, Sep 06 2018
%Y A203817 Cf. A001620 (gamma), A000796 (Pi).
%K A203817 nonn,cons
%O A203817 1,2
%A A203817 _Yalcin Aktar_, Jan 06 2012