%I
%S 1,5,17,109,157,317,389,449,709,1201,1237,1249,1429,1621,1801,2341,
%T 3001
%N 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.
%e 449 = 20^2 + 7^2 has 192 primitive roots, of which 41 are prime, of which 20 are in A002313.
%Y Cf. A002313, A084168.
%K nonn,fini,full,easy
%O 1,2
%A _Sven Simon_, May 17 2003
%E Offset changed to 1 by _Jinyuan Wang_, Mar 09 2020
%E Name edited by _Michel Marcus_, Mar 09 2020
