

A271836


Decimal expansion of 3^(1/3) / 2^(1/6).


1



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

1,2


COMMENTS

Used in a formula for a regular octahedron, a = 3^(1/3)/2^(1/6) * V^(1/3), where a is the edge length and V^(1/3) is the cube root of the volume.
An algebraic number of degree 6 and denominator 2; minimal polynomial is 2x^6  9.  Charles R Greathouse IV, Apr 18 2016


LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..10000
Wikipedia, Octahedron


FORMULA

Equals A002581 / A010768.


EXAMPLE

1.2848982934253252956716...


MAPLE

Digits:=100: evalf(3^(1/3)/2^(1/6));


MATHEMATICA

RealDigits[N[3^(1/3)/2^(1/6), 100]]


PROG

(PARI) 3^(1/3) / 2^(1/6) \\ Altug Alkan, Apr 15 2016
(PARI) sqrtn(9/2, 6) \\ Charles R Greathouse IV, Apr 18 2016


CROSSREFS

Cf. A002581, A010768.
Sequence in context: A253883 A247445 A151928 * A021355 A192034 A209874
Adjacent sequences: A271833 A271834 A271835 * A271837 A271838 A271839


KEYWORD

nonn,cons,easy


AUTHOR

Wesley Ivan Hurt, Apr 15 2016


STATUS

approved



