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A084167
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Numbers k in A002313 such that the count of primitive roots of k (A084168) are also in sequence A002313, where A002313 is the list of primes p having a unique representation as the sum of two squares, p = x^2 + y^2.
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1
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1, 5, 17, 109, 157, 317, 389, 449, 709, 1201, 1237, 1249, 1429, 1621, 1801, 2341, 3001
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..17.
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EXAMPLE
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449 = 20^2 + 7^2 has 192 primitive roots, of which 41 are prime, of which 20 are in A002313.
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CROSSREFS
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Cf. A002313, A084168.
Sequence in context: A240803 A098028 A100301 * A267143 A331636 A234797
Adjacent sequences: A084164 A084165 A084166 * A084168 A084169 A084170
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KEYWORD
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nonn,fini,full,easy
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AUTHOR
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Sven Simon, May 17 2003
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EXTENSIONS
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Offset changed to 1 by Jinyuan Wang, Mar 09 2020
Name edited by Michel Marcus, Mar 09 2020
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STATUS
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approved
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