id:A128859 - OEIS Search Results

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Let p = n-th odd prime; a(n) = number of primitive roots of p which are <= (p-1)/2.

+0
2

0, 1, 1, 1, 2, 4, 2, 4, 6, 4, 6, 8, 6, 9, 12, 10, 8, 10, 9, 12, 10, 16, 20, 16, 20, 13, 22, 18, 24, 17, 18, 32, 18, 36, 16, 24, 26, 36, 42, 37, 24, 29, 32, 42, 23, 16, 38, 49, 36, 56, 44, 32, 44, 64, 59, 66, 33, 44, 48, 40, 72, 48, 55, 48, 78, 35, 48, 79, 56, 80, 80, 60, 60, 55 (list; graph; listen)

	OFFSET	`1,5`
	REFERENCES	`R. Osborn, Tables of All Primitive Roots of Odd Primes Less Than 1000, Univ. Texas Press, Austin, TX, 1961, pp. 69-70.`
	CROSSREFS	`Cf. A118818.` `Sequence in context: A047947 A018838 A116982 this_sequence A047975 A112791 A051638` `Adjacent sequences: A128856 A128857 A128858 this_sequence A128860 A128861 A128862`
	KEYWORD	`nonn,easy`
	AUTHOR	`njas, Apr 20 2007`
	EXTENSIONS	`More terms from Don Reble (djr(AT)nk.ca), Apr 20 2007`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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