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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A081029 Highly central numbers: numbers having a centrality higher than that of any larger number. 3
1, 2, 3, 4, 6, 8, 12, 15, 18, 20, 24, 30, 36, 40, 42, 48, 60, 72, 84, 90, 120, 126, 144, 180, 210, 240 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

COMMENTS

A subset of A081000.

FORMULA

Formula for centrality of n: A018804(n)/n^2 (cf. A080997 for fuller description of this concept).

CROSSREFS

Cf. A080997, A080998 for centrality rankings of the positive integers.

Sequence in context: A114312 A095041 A178751 * A171966 A034893 A187448

Adjacent sequences:  A081026 A081027 A081028 * A081030 A081031 A081032

KEYWORD

nonn

AUTHOR

Matthew Vandermast (ghodges14(AT)comcast.net), Mar 02 2003

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 16 21:51 EST 2012. Contains 205978 sequences.