id:A048984 - OEIS Search Results

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As n runs through composite numbers, a(n) = number of nonprime d < n such that GCD(d,n) = 1.

+0
2

1, 1, 1, 3, 2, 1, 2, 4, 3, 1, 2, 6, 4, 1, 12, 5, 10, 5, 1, 6, 11, 7, 15, 3, 8, 14, 6, 2, 8, 12, 10, 3, 28, 7, 19, 11, 4, 26, 10, 22, 14, 2, 14, 20, 15, 32, 5, 15, 27, 8, 6, 17, 21, 17, 41, 6, 12, 33, 20, 4, 43, 21, 35, 19, 3, 50, 22, 38, 24, 50, 10, 19, 37 (list; graph; listen)

	OFFSET	`0,4`
	EXAMPLE	`9 is 4th composite number, GCD(9,1)=GCD(9,4)=GCD(9,8)=1, so a(4) = 3.`
	CROSSREFS	`Cf. A000010, A048983.` `Sequence in context: A120441 A136560 A105847 this_sequence A136531 A127318 A085068` `Adjacent sequences: A048981 A048982 A048983 this_sequence A048985 A048986 A048987`
	KEYWORD	`easy,nonn`
	AUTHOR	`Naohiro Nomoto (6284968128(AT)geocities.co.jp)`

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

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