id:A072209 - OEIS Search Results

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Number of primitive roots of those integers with at least one primitive root.

+0
2

1, 1, 1, 1, 2, 1, 2, 2, 2, 4, 4, 2, 8, 2, 6, 4, 10, 8, 4, 6, 12, 8, 8, 12, 6, 16, 12, 10, 22, 12, 8, 24, 6, 12, 28, 16, 8, 20, 24, 24, 12, 24, 18, 16, 40, 12, 40 (list; graph; listen)

	OFFSET	`1,5`
	COMMENT	`Essentially sequence A046144 with all zero entries deleted.`
	LINKS	`T. D. Noe, Table of n, a(n) for n=1..10000`
	FORMULA	`a(n)=phi[phi{A033948(n)}].`
	CROSSREFS	`Cf. A046144.` `Sequence in context: A029203 A159805 A009213 this_sequence A060169 A117958 A113401` `Adjacent sequences: A072206 A072207 A072208 this_sequence A072210 A072211 A072212`
	KEYWORD	`nice,nonn`
	AUTHOR	`Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 03 2002`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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