A141645 - OEIS

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A141645

Numbers n such that sigma(n)/n = 9/2.

8910720, 17428320, 8583644160, 57629644800, 206166804480, 1416963251404800, 15338300494970880, 6275163455171297280, 200286975596707184640, 215594611071909888000, 5997579964837140234240, 39887491844324122951680 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`200286975596707184640 belongs to this sequence. [From Gerard P. Michon (g.michon(AT)att.net), May 10 2009]` `81703797123392614369698250752 is in this sequence. [From Gerard P. Michon (g.michon(AT)att.net), May 11 2009]`
	LINKS	`G. P. Michon, Table of n, a(n) for n=1..27` `G. P. Michon, Multiperfect and hemiperfect integers [From Gerard P. Michon (g.michon(AT)att.net), Jun 04 2009]` `Walter Nissen, Abundancy : Some Resources` `Walter Nissen, Home Page (listed in lieu of email address)`
	CROSSREFS	`Cf. A055153, A141643, A159271, A160678.` `Cf. A159907 = (half-integer abundancy) [From Gerard P. Michon (g.michon(AT)att.net), May 10 2009]` `Sequence in context: A179577 A203669 A078143 * A151933 A162021 A157815` `Adjacent sequences: A141642 A141643 A141644 * A141646 A141647 A141648`
	KEYWORD	`nonn`
	AUTHOR	`Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp), May 10 2008`
	EXTENSIONS	`Definition rewritten by M. F. Hasler, May 10 2008` `Is it certain that there are no other terms below the highest value shown? - N. J. A. Sloane (njas(AT)research.att.com), Sep 07 2008` `Corrected a(1), confirmed a(3) - Ray Chandler (rayjchandler(AT)sbcglobal.net), Sep 18 2008` `Missing term a(2)= 17428320 communicated by Walter Nissen Apr 17 2009. There are no further terms through 2^34.` `Missing term a(4) inserted and a(6) and a(8) added by Grzegorz Lach (137.036(AT)gmail.com), Apr 18 2009. a(4) was also sent by Avinoam Kalma (a.kalma(AT)gmail.com), Apr 20 2009.` `a(7) = 15338300494970880 added by Gerard P. Michon (g.michon(AT)att.net), May 10 2009.` `a(10)=215594611071909888000 [and above] from Michel Marcus, added by Gerard P. Michon (g.michon(AT)att.net), Jun 04 2009`

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Last modified February 13 09:25 EST 2012. Contains 205451 sequences.