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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108053 Maximum number of diagonals of a regular n-gon that meet at a non-center point. 0
0, 2, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 7, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 7, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 7, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2, 5, 2, 3, 2, 3, 2 (list; graph; refs; listen; history; internal format)
OFFSET

3,2

LINKS

B. Poonen and M Rubinstein, The Number of Intersection Points Made by the Diagonals of a Regular Polygon, 1995.

Sequences formed by drawing all diagonals in regular polygon

FORMULA

Starting at a(5) = 2, sequence is periodic with period 30.

EXAMPLE

In a 30-gon, there are non-center points where 7 diagonals meet, but no more than 7. Hence a(30) = 7.

CROSSREFS

Sequence in context: A159580 A021448 A195719 * A133501 A124316 A061034

Adjacent sequences:  A108050 A108051 A108052 * A108054 A108055 A108056

KEYWORD

easy,nonn

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net), Jun 01 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 19:15 EST 2012. Contains 205852 sequences.