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 A201504 #16 Jun 27 2023 05:12:32 %S A201504 4,7,9,4,2,5,5,3,8,6,0,4,2,0,3,0,0,0,2,7,3,2,8,7,9,3,5,2,1,5,5,7,1,3, %T A201504 8,8,0,8,1,8,0,3,3,6,7,9,4,0,6,0,0,6,7,5,1,8,8,6,1,6,6,1,3,1,2,5,5,3, %U A201504 5,0,0,0,2,8,7,8,1,4,8,3,2,2,0 %N A201504 Decimal expansion of sin(1/2). %C A201504 By the Lindemann-Weierstrass theorem, this constant is transcendental. - _Charles R Greathouse IV_, May 13 2019 %H A201504 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>. %F A201504 Equals 1/2 - 1/(2^3*3!) + 1/(2^5/5!) - 1/(2^7*7!) + ..., Taylor series of sin(x). %F A201504 Equals sqrt((1-A049470)/2). %e A201504 0.47942553860420300027... %p A201504 evalf(sin(1/2)) ; %t A201504 RealDigits[Sin[1/2], 10, 120][[1]] (* _Amiram Eldar_, Jun 27 2023 *) %o A201504 (PARI) sin(.5) \\ _Charles R Greathouse IV_, May 13 2019 %Y A201504 Cf. A049470. %K A201504 cons,easy,nonn %O A201504 0,1 %A A201504 _R. J. Mathar_, Dec 02 2011