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 A197592 #8 Feb 27 2013 03:32:21 %S A197592 1,2,3,3,3,5,1,9,0,4,0,0,1,8,9,3,4,2,9,1,4,8,9,8,9,2,0,7,9,8,3,6,6,4, %T A197592 2,2,6,1,6,0,7,6,2,9,3,3,9,8,4,5,1,2,5,5,1,1,1,2,1,8,8,2,5,6,0,4,5,3, %U A197592 0,8,2,9,9,6,8,5,5,4,0,0,6,4,8,0,3,8,7,0,4,2,9,2,9,6,7,5,0,8,9 %N A197592 Decimal expansion of least x>0 having (cos(x))^2+(sin(2x))^2=1/2. %C A197592 For a discussion and guide to related sequences, see A197739. %e A197592 x=1.2333519040018934291489892079836642261607... %t A197592 (See the program at A197589.) %t A197592 RealDigits[ ArcCos[ Sqrt[ (5-Sqrt[17])/2 ]/2 ], 10, 99] // First (* _Jean-François Alcover_, Feb 27 2013 *) %Y A197592 Cf. A197739, A197589. %K A197592 nonn,cons %O A197592 1,2 %A A197592 _Clark Kimberling_, Oct 18 2011