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A088543 Decimal expansion of sqrt(15)/2. 7
1, 9, 3, 6, 4, 9, 1, 6, 7, 3, 1, 0, 3, 7, 0, 8, 4, 4, 2, 5, 8, 9, 6, 3, 2, 6, 9, 9, 8, 9, 1, 1, 9, 9, 8, 0, 5, 4, 1, 6, 4, 6, 0, 8, 5, 2, 6, 4, 5, 7, 9, 5, 4, 1, 3, 2, 9, 3, 7, 8, 6, 8, 8, 3, 0, 5, 6, 7, 4, 1, 5, 4, 5, 9, 6, 8, 4, 8, 9, 5, 1, 6, 7, 5, 9, 6, 4, 3, 6, 8, 8, 4, 2, 9, 3, 3, 6, 7, 5, 8, 9, 5, 8, 1, 5 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
This is the ratio of the base of an isosceles triangle to its height when the other two sides are each equal to twice the base.
Exradius opposite the side of length 3 of the obtuse scalene triangle with sides of lengths 2, 3 and 4, the scalene triangle with least integer side lengths. See formulas in the Weisstein link. - Rick L. Shepherd, May 14 2008
LINKS
Eric Weisstein's World of Mathematics, Exradius.
FORMULA
sqrt(15)/2 = A010472/2 = A140249/3. - Rick L. Shepherd, May 14 2008
EXAMPLE
1.93649167310370844258963269989119980541646085264579541329378688305674154596...
CROSSREFS
Cf. A010527.
Sequence in context: A169849 A182547 A019737 * A256854 A182552 A021985
KEYWORD
cons,nonn
AUTHOR
Christopher M. Tomaszewski (cmt1288(AT)comcast.net), Nov 16 2003
EXTENSIONS
More terms from Rick L. Shepherd, May 14 2008
STATUS
approved

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Last modified March 29 09:44 EDT 2024. Contains 371268 sequences. (Running on oeis4.)