id:A079530 - OEIS Search Results

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phi(n) - ceiling(sqrt n).

+0
7

0, -1, 0, 0, 1, -1, 3, 1, 3, 0, 6, 0, 8, 2, 4, 4, 11, 1, 13, 3, 7, 5, 17, 3, 15, 6, 12, 6, 22, 2, 24, 10, 14, 10, 18, 6, 29, 11, 17, 9, 33, 5, 35, 13, 17, 15, 39, 9, 35, 12, 24, 16, 44, 10, 32, 16, 28, 20, 50, 8, 52, 22, 28, 24, 39, 11, 57, 23, 35, 15, 61, 15, 63, 27, 31, 27, 51, 15, 69, 23, 45 (list; graph; listen)

	OFFSET	`1,7`
	COMMENT	`a(n) >= 0 except for n = 2 and 6.`
	REFERENCES	`D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, p. 9.`
	CROSSREFS	`Cf. A000010, A079531-A079534.` `Adjacent sequences: A079527 A079528 A079529 this_sequence A079531 A079532 A079533` `Sequence in context: A073747 A127549 A082648 this_sequence A020815 A132301 A073272`
	KEYWORD	`sign`
	AUTHOR	`njas, Jan 23 2003`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.

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