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A084167
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.
1
1, 5, 17, 109, 157, 317, 389, 449, 709, 1201, 1237, 1249, 1429, 1621, 1801, 2341, 3001
OFFSET
1,2
EXAMPLE
449 = 20^2 + 7^2 has 192 primitive roots, of which 41 are prime, of which 20 are in A002313.
CROSSREFS
Sequence in context: A240803 A098028 A100301 * A267143 A331636 A234797
KEYWORD
nonn,fini,full,easy
AUTHOR
Sven Simon, May 17 2003
EXTENSIONS
Offset changed to 1 by Jinyuan Wang, Mar 09 2020
Name edited by Michel Marcus, Mar 09 2020
STATUS
approved