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A020773 Decimal expansion of 1/4. 4

%I

%S 2,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%T 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%U 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

%N Decimal expansion of 1/4.

%C Also, decimal expansion of 1/2 * integral_0^infinity 1/cosh(Pi*x) dx. - _Bruno Berselli_, Mar 20 2013

%C In the complex plane, this purely real number gives the coordinates for the inward cusp of the main cardioid of the Mandelbrot set. - _Alonso del Arte_, Jun 05 2016

%t RealDigits[1/4, 10, 100][[1]] (* _Alonso del Arte_, Jun 05 2016 *)

%o (PARI) .25 \\ _Charles R Greathouse IV_, Apr 15 2015

%K nonn,cons,easy

%O 0,1

%A _N. J. A. Sloane_.

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Last modified November 11 18:50 EST 2019. Contains 329031 sequences. (Running on oeis4.)