id:A069549 - OEIS Search Results

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Smallest composite k such that phi(k) > k*(1-1/n).

+0
3

4, 4, 9, 25, 25, 49, 49, 121, 121, 121, 121, 169, 169, 289, 289, 289, 289, 361, 361, 529, 529, 529, 529, 841, 841, 841, 841, 841, 841, 961, 961, 1369, 1369, 1369, 1369, 1369, 1369, 1681, 1681, 1681, 1681, 1849, 1849, 2209, 2209, 2209, 2209, 2809, 2809, 2809 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`Or, least composite k such that k is coprime to the n-1 numbers k+1 ... k+n-1. E.g. a(4) = 25 because 25 is coprime to 26, 27 and 28. - Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 20 2004`
	FORMULA	`a(n)=nextprime(n)^2=A007918(n)^2`
	CROSSREFS	`Cf. A052349.` `Sequence in context: A067553 A112683 A117879 this_sequence A118069 A089539 A117416` `Adjacent sequences: A069546 A069547 A069548 this_sequence A069550 A069551 A069552`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 21 2002`
	EXTENSIONS	`Edited by David Wasserman (wasserma(AT)spawar.navy.mil), Apr 23 2007`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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