id:A091439 - OEIS Search Results

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

+0
2

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

	OFFSET	`1,2`
	COMMENT	`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 this_sequence A013083 A110387 A158682` `Adjacent sequences: A091436 A091437 A091438 this_sequence A091440 A091441 A091442`
	KEYWORD	`easy,nonn`
	AUTHOR	`T. D. Noe (noe(AT)sspectra.com), Jan 09 2004`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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