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A356470
Decimal expansion of (3 - sqrt(5))/(2*sqrt(2)).
0
2, 7, 0, 0, 9, 0, 7, 5, 6, 7, 3, 7, 7, 2, 6, 4, 5, 3, 6, 0, 1, 5, 4, 3, 1, 5, 7, 0, 4, 9, 0, 9, 3, 9, 2, 5, 4, 9, 7, 3, 6, 5, 1, 2, 1, 7, 0, 1, 4, 0, 6, 8, 4, 8, 1, 6, 8, 1, 3, 3, 5, 9, 0, 2, 9, 4, 9, 0, 0, 7, 4, 9, 1, 8, 6, 7, 7, 0, 7, 2, 3, 8, 0, 1, 7, 2, 8, 6, 2
OFFSET
0,1
COMMENTS
Distance between points in the most spread-out hexagonal lattice such that the gap formed by any three mutually tangential unit disks contains a point inside or on its boundary.
Side-length of an equilateral triangle contained in a unit side-length equilateral triangle such that every vertex and midpoint of the smaller triangle is at distance 1/2 from the nearest vertex of the larger triangle.
A quartic number with denominator 2. Minimal polynomial is 4x^4 - 14x^2 + 1. - Charles R Greathouse IV, Sep 29 2022
EXAMPLE
0.2700907567377264536...
MATHEMATICA
First[RealDigits[N[(3-Sqrt[5])/(2Sqrt[2]), 89]]] (* Stefano Spezia, Aug 08 2022 *)
PROG
(PARI) (3-sqrt(5))/sqrt(8) \\ Charles R Greathouse IV, Sep 29 2022
CROSSREFS
Cf. A002193.
Sequence in context: A100378 A020819 A111953 * A260929 A290789 A199292
KEYWORD
nonn,cons
AUTHOR
Andrew Slattery, Aug 08 2022
EXTENSIONS
More terms from Stefano Spezia, Aug 08 2022
STATUS
approved