A181693 - OEIS

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A181693

Decimal expansion of AGM(1-x,1+x), where x=1/(10^27+1).

9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 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, 4, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9

(list; constant; graph; refs; listen; history; text; internal format)

OFFSET

0,1

COMMENTS

0.999999999...9999999999750000000...000004999999...9999991718750000000...000001312499... (see the first link).

LINKS

Table of n, a(n) for n=0..103.

Gerd Lamprecht, Almost Integer, Patterns in decimals

Gerd Lamprecht, 10000 digit from A-646 in pi.gerdlamprecht.de database

FORMULA

Equals Pi/(2*K(1/(10^27+1)^2)), where K is the complete elliptic integral of the first kind. - Bruno Berselli, Mar 07 2013

EXAMPLE