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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A023393 Maximal number of circles of radius 1 that can be packed in a circle of radius n. 6

%I

%S 0,1,2,7,11,19,27,38,50,64,80,98,118

%N Maximal number of circles of radius 1 that can be packed in a circle of radius n.

%C The terms for n>5 are only conjectures supported by extensive computations.

%D For list of references given by E. Specht, see corresponding link.

%H E. Specht, <a href="http://hydra.nat.uni-magdeburg.de/packing/cci/cci.html">The best known packings of equal circles in the unit circle</a>

%Y Cf. A084618, A084617, A084644.

%Y Cf. A201993 (conjectured lower bounds for a(n)).

%K more,nonn,hard

%O 0,3

%A _David W. Wilson_

%E Terms for n>5 from _Hugo Pfoertner_, Jun 01 2003

%E Mohammed Bouayoun (mohammed.bouayoun(AT)sanef.com), Feb 18 2004, writes to suggest that the sequence probably continues 138, 161, 187, 213, 242, 272, 304, 337, 373, 413, 451, 495, ...

%E Edited by _N. J. A. Sloane_ at the suggestion of _David W. Wilson_, Sep 22 2007

%E Offset corrected by _Jon E. Schoenfield_, Oct 12 2008

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 September 20 16:48 EDT 2019. Contains 327242 sequences. (Running on oeis4.)