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 A197582 #15 Feb 16 2025 05:39:50 %S A197582 1,4,9,4,4,4,3,8,1,9,6,1,2,0,8,7,3,8,9,6,7,4,0,8,2,2,7,8,1,7,5,5,3,0, %T A197582 0,6,0,6,7,6,2,9,8,4,3,4,2,7,0,0,6,2,0,7,2,7,7,4,8,7,7,7,9,2,3,0,6,9, %U A197582 4,7,9,4,8,5,1,5,0,3,6,3,0,9,5,2,2,3,0,1 %N A197582 Decimal expansion of least x>0 having cos(Pi*x/3)=(cos(x))^2. %C A197582 This number is irrational. I cannot prove it to be algebraic or transcendental. - _Charles R Greathouse IV_, Feb 16 2025 %e A197582 1.4944438196120873896740822781755300606762984342700620727748777923069479... %o A197582 (PARI) solve(x=1,2,cos(Pi/3*x)-cos(x)^2) \\ _Charles R Greathouse IV_, Oct 18 2011 %Y A197582 Cf. A197133. %K A197582 nonn,cons %O A197582 1,2 %A A197582 _Clark Kimberling_, Oct 16 2011 %E A197582 Corrected by _Charles R Greathouse IV_, Oct 18 2011