OFFSET
1,1
COMMENTS
Also the perimeter of an ellipse with semi-axis lengths 2 and 1. - Jeremy Tan, May 31 2016
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Quadrifolium
EXAMPLE
9.6884482205476761984...
MAPLE
evalf(8*EllipticE(sqrt(3)/2), 120); # Vaclav Kotesovec, Apr 22 2015
MATHEMATICA
RealDigits[8 EllipticE[3/4], 10, 120][[1]] (* Harvey P. Dale, Jun 20 2011 *)
PROG
(SageMath) numerical_approx( 8*elliptic_ec(3/4), digits=130) # G. C. Greubel, Apr 22 2024
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Eric W. Weisstein, Mar 20 2008
STATUS
approved