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A084167 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. 1
1, 5, 17, 109, 157, 317, 389, 449, 709, 1201, 1237, 1249, 1429, 1621, 1801, 2341, 3001 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..16.

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 * A267143 A234797 A062586

Adjacent sequences:  A084164 A084165 A084166 * A084168 A084169 A084170

KEYWORD

easy,fini,full,nonn

AUTHOR

Sven Simon, May 17 2003 Sven Simon

STATUS

approved

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Last modified February 25 13:30 EST 2018. Contains 299654 sequences. (Running on oeis4.)