login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A088543 Decimal expansion of sqrt(15)/2. 6
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

Table of n, a(n) for n=1..105.

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.

Cf. A140239, A140246, A140247, A140248, A140249, A010472.

Sequence in context: A169849 A182547 A019737 * A256854 A182552 A021985

Adjacent sequences:  A088540 A088541 A088542 * A088544 A088545 A088546

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 23 17:32 EDT 2019. Contains 328373 sequences. (Running on oeis4.)