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A020773 Decimal expansion of 1/4. 4
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, 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, 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 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Also, decimal expansion of  1/2 * integral_0^infinity 1/cosh(Pi*x) dx. - Bruno Berselli, Mar 20 2013

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

LINKS

Table of n, a(n) for n=0..98.

MATHEMATICA

RealDigits[1/4, 10, 100][[1]] (* Alonso del Arte, Jun 05 2016 *)

PROG

(PARI) .25 \\ Charles R Greathouse IV, Apr 15 2015

CROSSREFS

Sequence in context: A252783 A192225 A020821 * A249422 A100085 A159986

Adjacent sequences:  A020770 A020771 A020772 * A020774 A020775 A020776

KEYWORD

nonn,cons,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified December 18 14:26 EST 2018. Contains 318229 sequences. (Running on oeis4.)