A091439 - OEIS

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A091439

Least k such that k/phi(k) >= n, where phi is Euler's totient function.

1, 2, 6, 210, 30030, 223092870, 13082761331670030, 3217644767340672907899084554130, 1492182350939279320058875736615841068547583863326864530410 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`These are all primorial numbers (A002110).`
	LINKS	`Eric Weisstein's World of Mathematics, Totient Function`
	MATHEMATICA	`Table[prod=1; i=0; While[prod<n, i++; prod=prod/(1-1/Prime[i])]; Times@@Prime[Range[i]], {n, 1, 9}]`
	CROSSREFS	`Sequence in context: A055696 A158096 A156517 * A176782 A013083 A110387` `Adjacent sequences: A091436 A091437 A091438 * A091440 A091441 A091442`
	KEYWORD	`easy,nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Jan 09 2004`

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Last modified February 14 10:43 EST 2012. Contains 205614 sequences.