id:A109510 - OEIS Search Results

Search: id:A109510

Displaying 1-1 of 1 results found.

page 1

Values of n such that sigma(n)-2n (the abundance of n) is a (positive) square.

+0
1

6, 12, 28, 70, 88, 108, 168, 220, 348, 496, 550, 580, 726, 748, 798, 910, 918, 952, 1032, 1120, 1200, 1240, 1504, 1644, 1672, 1840, 1888, 2140, 2205, 2392, 2470, 2472, 2814, 3190, 3222, 3580, 3804, 4030, 4648, 4732, 4758, 5032, 5670, 5830 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`Eric Weisstein's World of Mathematics, Abundance`
	CROSSREFS	`Sequence in context: A057341 A068412 A146005 this_sequence A034715 A079390 A124679` `Adjacent sequences: A109507 A109508 A109509 this_sequence A109511 A109512 A109513`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com), Jun 30, 2005`

page 1

Search completed in 0.002 seconds

Last modified November 25 13:42 EST 2009. Contains 167481 sequences.

AT&T Labs Research