id:A079534 - OEIS Search Results

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phi(n) - ceiling( (log 2 / 2) * (n / log n) ).

+0
5

0, 1, 1, 2, 0, 4, 2, 4, 2, 8, 2, 10, 4, 6, 6, 13, 3, 15, 5, 9, 7, 19, 5, 17, 9, 15, 9, 25, 4, 26, 12, 16, 12, 20, 8, 32, 14, 20, 12, 36, 8, 38, 15, 19, 17, 41, 11, 37, 15, 27, 19, 47, 13, 35, 19, 31, 23, 52, 10, 54, 24, 30, 26, 42, 14, 60, 26, 38, 18, 64, 18, 66, 30, 33, 29, 53, 17, 71, 25 (list; graph; listen)

	OFFSET	`2,4`
	COMMENT	`It is known that a(n) >= 0.`
	REFERENCES	`D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, p. 9.`
	CROSSREFS	`Cf. A000010, A079530, A079531, A079532, A079533.` `Sequence in context: A028609 A107490 A094572 this_sequence A097042 A097945 A153733` `Adjacent sequences: A079531 A079532 A079533 this_sequence A079535 A079536 A079537`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Jan 23 2003`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

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