A051986 - OEIS

%I #7 Sep 21 2021 07:09:20

%S 394,865,1769,1985,2561,2762,3098,4385,5465,5485,5965,6122,7141,7265,

%T 10565,11101,11485,11581,13285,13466,14381,14765,16442,21365,22565,

%U 28373,34493,35197,36221,44861,47477,48485,48941,51365,54317

%N Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 21.

%D R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A3.

%H Georg Fischer, <a href="/A051986/b051986.txt">Table of n, a(n) for n = 1..59</a>

%Y Cf. A051966-A051989.

%K nonn,fini,full

%O 1,1

%A _N. J. A. Sloane_, Jan 04 2000