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%I #7 Sep 21 2021 07:09:01
%S 511,559,606,790,1002,1065,1079,1182,1195,1374,1415,1510,1513,1537,
%T 1603,1687,1961,2193,2215,2455,2471,2627,2863,3155,3239,3295,3383,
%U 3647,3746,3857,4163,4295,4458,4535,4595,4727,4782,4847,4922,5038
%N Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 20.
%D R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A3.
%H Georg Fischer, <a href="/A051985/b051985.txt">Table of n, a(n) for n = 1..161</a>
%Y Cf. A051966-A051989.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, Jan 04 2000