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 A019597 #20 Sep 08 2022 08:44:44 %S A019597 1,7,0,7,9,4,6,8,4,4,5,3,4,7,1,3,4,1,3,0,9,2,7,1,0,1,7,3,9,0,9,3,1,4, %T A019597 8,9,9,0,0,6,9,7,7,7,0,7,1,5,3,0,2,2,9,9,2,3,7,5,9,2,0,2,2,6,0,3,5,8, %U A019597 4,5,7,2,2,2,3,1,4,6,6,1,6,1,5,1,4,5,1,2,7,7,3,9,4,2,0,9,4,7,8,8,7,8,2,7,5 %N A019597 Decimal expansion of 2*Pi*e. %C A019597 Equals imaginary part of (E + Pi*i)^2. - _Arkadiusz Wesolowski_, Jan 13 2013 %H A019597 Ivan Panchenko, <a href="/A019597/b019597.txt">Table of n, a(n) for n = 2..1000</a> %e A019597 17.079468... %p A019597 evalf(2*Pi*exp(1)) ; %t A019597 RealDigits[N[2*Pi*E, 105]][[1]] (* _Arkadiusz Wesolowski_, Jan 13 2013 *) %o A019597 (PARI) 2*Pi*exp(1) \\ _Charles R Greathouse IV_, Jan 13 2013 %o A019597 (Magma) SetDefaultRealField(RealField(100)); R:=RealField(); 2*Pi(R)*Exp(1); // _G. C. Greubel_, Aug 24 2018 %K A019597 nonn,cons %O A019597 2,2 %A A019597 _N. J. A. Sloane_