A093728 - OEIS

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A093728

Decimal expansion of 2E(2i sqrt(2)), where E(k) is the complete elliptic integral of the 2nd kind.

6, 6, 8, 2, 4, 4, 6, 6, 1, 0, 2, 7, 7, 6, 2, 9, 1, 1, 5, 0, 6, 4, 7, 5, 1, 1, 6, 2, 5, 3, 0, 0, 9, 8, 1, 1, 9, 7, 0, 0, 4, 9, 1, 3, 3, 6, 1, 9, 4, 5, 8, 8, 5, 5, 1, 6, 4, 6, 4, 8, 0, 1, 9, 8, 2, 4, 6, 2, 9, 2, 7, 0, 9, 5, 2, 3, 2, 8, 4, 8, 0, 4, 0, 1, 2, 9, 5, 5, 3, 2, 4, 0, 5, 8, 1, 9, 9, 1, 0, 6, 4, 5

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

OFFSET

1,1

COMMENTS

Arc length of the trifolium r = a*cos(3*theta).

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Trifolium

FORMULA

Equals 2*A249491. - Altug Alkan, Oct 02 2018

EXAMPLE

6.68244661027762911506475116253009811970049133619458855164648...