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%I #11 Sep 21 2021 15:47:07
%S 9,1,3,1,1,1,19,7,23,25,5,9,1,31,1,7,7,1,3,1,13,41,43,3,15,15,9,3,7,1,
%T 49,17,1,53,11,11,19,59,3,1,13,4,1,23,5,15,7,11,27,5,5,1,3,1,7,1,19,3,
%U 101,7,3,3,11,25,127,43,7,27,13,29,3,31,3,1,25,59,179,9,7,47,13
%N Consider real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r^2*k^2+4k, k odd; sequence gives values of r.
%C Excludes discriminants appearing in A051990.
%D R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A4(3), column r.
%Y Cf. A051990, A051991, A051992, A051993, A051994, A051996, A051997, A051998.
%K nonn,fini,full
%O 1,1
%A _N. J. A. Sloane_, Jan 04 2000
%E Offset changed to 1 by _Georg Fischer_, Sep 21 2021
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