A081029 Highly central numbers: numbers having a centrality higher than that of any larger number.

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

Offset

1,2

Comments

A subset of A081000.

Links

Table of n, a(n) for n=1..26.

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: A232711 A178751 A309353 * A300787 A171966 A034893

Adjacent sequences: A081026 A081027 A081028 * A081030 A081031 A081032

Keyword

nonn

Author

Matthew Vandermast, Mar 02 2003

Status

approved