|
|
A258428
|
|
Decimal expansion of arctan(1/e).
|
|
3
|
|
|
3, 5, 2, 5, 1, 3, 4, 2, 1, 7, 7, 7, 6, 1, 8, 9, 9, 7, 4, 7, 0, 8, 5, 9, 9, 2, 2, 7, 2, 3, 9, 5, 3, 5, 0, 0, 3, 5, 9, 4, 5, 2, 7, 5, 0, 2, 1, 9, 3, 9, 6, 4, 0, 5, 4, 3, 7, 8, 1, 2, 0, 3, 3, 2, 0, 5, 7, 2, 9, 9, 8, 6, 8, 4, 2, 3, 4, 3, 7, 3, 5, 5, 5, 2, 0, 4, 8, 2, 4, 4, 5, 1, 5, 2, 8, 6, 4, 0, 3, 2, 8, 8, 2, 1, 0
(list;
constant;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,1
|
|
COMMENTS
|
The slope of the unique straight line passing through the origin which kisses the logarithmic function y=log(x), i.e., the angle (in radians) the tangent line subtends with the X axis. The kissing point coordinates are (e,1).
|
|
LINKS
|
|
|
FORMULA
|
Equals Integral_{x=1..oo} 1/(2*cosh(x)) dx. - Amiram Eldar, Aug 10 2020
|
|
EXAMPLE
|
0.35251342177761899747085992272395350035945275021939640543781203320...
In degrees:
20.1975312895726498111743461325943940876066625590453644638010046029...
|
|
MATHEMATICA
|
|
|
PROG
|
(PARI) atan(1/exp(1))
|
|
CROSSREFS
|
|
|
KEYWORD
|
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|