A208899 - OEIS

A208899

Decimal expansion of sqrt(5)/3.

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

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OFFSET

0,1

COMMENTS

Equals the absolute value of the cosine of the dihedral angle between two adjacent faces of the regular icosahedron.

LINKS

Ivan Panchenko, Table of n, a(n) for n = 0..1000

Mathematics Stack Exchange, Maximum and Minimum Value of f(x)

Michael Penn, an "extreme" extreme value problem., YouTube video, 2022.

Wikipedia, Exsphere

FORMULA

Equals A002163/3 = 20*A020837/3.