A091456 - OEIS

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A091456

Least number k such that n * phi(k) < k, where phi is Euler's totient function.

2, 6, 30, 210, 30030, 223092870, 13082761331670030, 3217644767340672907899084554130, 1492182350939279320058875736615841068547583863326864530410 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	COMMENTS	`By Mertens' theorem and the Prime Number Theorem log log a(n) ~ n / e^gamma. - Charles R Greathouse IV, Sep 07 2012`
	LINKS	`Table of n, a(n) for n=1..9.`
	CROSSREFS	`Subsequence of A002110. Cf. A000010, A054741, A073087, A091456 (n * phi(k) <= k).` `Sequence in context: A192929 A077176 A101178 * A161620 A205569 A108204` `Adjacent sequences: A091453 A091454 A091455 * A091457 A091458 A091459`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v, Jan 10 2004`
	STATUS	`approved`

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Last modified May 19 17:18 EDT 2013. Contains 225434 sequences.