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 A138500 Decimal expansion of arc length of the quadrifolium. 0
 9, 6, 8, 8, 4, 4, 8, 2, 2, 0, 5, 4, 7, 6, 7, 6, 1, 9, 8, 4, 2, 8, 5, 0, 3, 1, 9, 6, 3, 9, 1, 8, 2, 9, 4, 1, 1, 9, 5, 3, 9, 1, 8, 3, 9, 7, 8, 8, 6, 6, 0, 0, 8, 2, 5, 0, 8, 3, 1, 1, 6, 3, 5, 2, 4, 6, 2, 1, 2, 0, 6, 4, 5, 9, 6, 2, 5, 5, 2, 1, 4, 8, 2, 9, 3, 4, 0, 0, 9, 4, 7, 4, 3, 3, 5, 8, 3, 9, 1, 8, 4, 9, 7, 9, 8 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Also the perimeter of an ellipse with semi-axis lengths 2 and 1. - Jeremy Tan, May 31 2016 LINKS 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 *) CROSSREFS Sequence in context: A021512 A154205 A258407 * A161484 A103985 A153071 Adjacent sequences:  A138497 A138498 A138499 * A138501 A138502 A138503 KEYWORD nonn,cons AUTHOR Eric W. Weisstein, Mar 20 2008 STATUS approved

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