A081029 - OEIS

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, 252, 264, 270, 280, 360, 420, 480, 504, 540, 630, 720, 840, 900, 1008, 1080, 1260, 1320, 1440, 1680, 1800, 1980, 2520, 2640, 2772, 2880, 3360, 3780, 3960

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

A subset of A081000.

LINKS

Table of n, a(n) for n=1..54.

FORMULA

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

CROSSREFS

Cf. A080998 for centrality rankings of the positive integers.

Records in A080997.