id:A141406 - OEIS Search Results

Search: id:A141406

Displaying 1-1 of 1 results found.

page 1

Numbers n where the sum of all of its divisors < sqrt(n) exceeds the sum of all the divisors of m < sqrt(m) for all m<n.

+0
2

1, 2, 6, 12, 20, 24, 30, 40, 48, 60, 72, 90, 120, 168, 180, 240, 336, 360, 420, 480, 504, 600, 630, 672, 720, 840, 1080, 1260, 1440, 1680, 2160, 2520, 3360, 3780, 3960, 4200, 4320, 4620, 5040, 6720, 7560, 9240, 10080, 12600, 13860, 15120, 18480, 20160 (list; graph; listen)

	OFFSET	`1,2`
	MATHEMATICA	`lst = {}; s = -1; Do[t = Plus @@ Select[Divisors@n, # < Sqrt@n &]; If[t > s, AppendTo[lst, n]; s = t], {n, 100000}]; lst`
	CROSSREFS	`Cf. A141037.` `Sequence in context: A061078 A067114 A102711 this_sequence A045619 A028690 A120344` `Adjacent sequences: A141403 A141404 A141405 this_sequence A141407 A141408 A141409`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 03 2008`

page 1

Search completed in 0.002 seconds

Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

AT&T Labs Research