A018894 - OEIS

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A018894

Numbers n such that sigma(n)/phi(n) sets a new record.

2, 4, 6, 12, 24, 30, 60, 120, 180, 210, 360, 420, 840, 1260, 1680, 2520, 4620, 9240, 13860, 18480, 27720, 55440, 110880, 120120, 180180, 240240, 360360, 720720, 1441440, 2162160, 3603600, 4084080, 4324320, 6126120, 12252240, 24504480 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	COMMENTS	`Remarkably similar to but ultimately different from A126098. - Jorg Brown and N. J. A. Sloane (njas(AT)research.att.com), Mar 06 2007`
	LINKS	`Jorg Brown, Comparison of records in sigma(n)/phi(n) and A018892`
	CROSSREFS	`Cf. A000203, A000010, A015702.` `Sequence in context: A066523 A097212 A126098 * A168264 A056795 A141420` `Adjacent sequences: A018891 A018892 A018893 * A018895 A018896 A018897`
	KEYWORD	`nonn`
	AUTHOR	`Michel ten Voorde (seqfan(AT)tenvoorde.org)`
	EXTENSIONS	`More terms from Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Nov 09 2001`

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.