%I #10 Dec 29 2021 02:23:56
%S 12,21,24,28,33,44,56,57,60,69,76,77,88,92,93,105,120,124,129,133,136,
%T 140,141,152,156,161,165,168,172,177,184,188,201,204,205,209,213,217,
%U 220,221,236,237,248,249,253,264,268,273,280,284,285,301,305,309,312,316
%N Discriminants of real quadratic fields whose fundamental unit has norm 1.
%D D. A. Buell, Binary Quadratic Forms, Springer-Verlag, NY, 1989, pp. 92-93.
%D Paulo Ribenboim, My Numbers, My Friends: Popular Lectures on Number Theory, Springer-Verlag, NY, 2000, p. 151.
%H <a href="/index/Qua#quadfield">Index entries for sequences related to quadratic fields</a>
%o (PARI) isok(D) = isfundamental(D) && norm(quadunit(D))==1;
%Y Cf. A003658, A003653 (discriminants of real quadratic fields whose fundamental unit has norm -1).
%Y Cf. A003656, A327297 (a subsequence).
%K nonn
%O 1,1
%A _Arkadiusz Wesolowski_, Nov 23 2021
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