id:A071888 - OEIS Search Results

Search: id:A071888

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a(1)=2 and for n>1 a(n) = least square-free m > n with gcd(m,n)>1.

+0
6

2, 6, 6, 6, 10, 10, 14, 10, 15, 14, 22, 14, 26, 21, 21, 22, 34, 21, 38, 22, 30, 26, 46, 26, 30, 30, 30, 30, 58, 33, 62, 34, 39, 38, 42, 38, 74, 42, 42, 42, 82, 46, 86, 46, 51, 58, 94, 51, 70, 55, 57, 58, 106, 57, 65, 58, 66, 62, 118, 62, 122, 66, 66, 66 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`A071889(n)=gcd(a(n),n); A071890(n)=a(n)-n;` `For n>2: n is prime iff a(n)=n*2.`
	CROSSREFS	`Cf. A005117, A071891, A071892.` `Sequence in context: A103643 A079892 A096014 this_sequence A117217 A161331 A120627` `Adjacent sequences: A071885 A071886 A071887 this_sequence A071889 A071890 A071891`
	KEYWORD	`nonn,nice`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 10 2002`

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Last modified December 8 08:31 EST 2009. Contains 170430 sequences.

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