id:A084167 - OEIS Search Results

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A002313 is the list of primes p having a unique representation as the sum of two squares, p = x^2 + y^2. If n is in the present sequence (and in A002313), the count of primitive roots of n which are in sequence A002313 too is x. The count of those primitive roots is A084168.

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1, 5, 17, 109, 157, 317, 389, 449, 709, 1201, 1237, 1249, 1429, 1621, 1801, 2341, 3001 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`449 = 20^2 + 7^2 has 192 primitive roots, of which 41 are prime, of which 20 are in A002313.`
	CROSSREFS	`Cf. A084168.` `Sequence in context: A098028 A100301 A096178 this_sequence A062586 A067710 A009240` `Adjacent sequences: A084164 A084165 A084166 this_sequence A084168 A084169 A084170`
	KEYWORD	`easy,fini,full,nonn`
	AUTHOR	`Sven Simon (sven-h.simon(AT)t-online.de), May 17 2003 Sven Simon`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

AT&T Labs Research