%I A079896
%S A079896 5,8,12,13,17,20,21,24,28,29,32,33,37,40,41,44,45,48,52,53,56,57,60,61,
%T A079896 65,68,69,72,73,76,77,80,84,85,88,89,92,93,96,97,101,104,105,108,109,
%U A079896 112,113,116,117,120,124,125,128,129,132,133,136,137,140,141,145,148
%N A079896 Discriminants of indefinite binary quadratic forms.
%C A079896 For an indefinite binary quadratic form over the integers a*x^2 + b*x*y 
               + c*y^2 the discriminant is D = b^2 - 4*a*c > 0; and D not a square 
               is assumed.
%D A079896 A. Scholz and B. Schoeneberg, Einfuehrung in die Zahlentheorie, 5. Aufl., 
               de Gruyter, Berlin, New York, 1973, p. 112.
%H A079896 S. R. Finch, <a href="http://algo.inria.fr/bsolve/">Class number theory</
               a>
%F A079896 a(n) is 0 (mod 4) or 1 (mod 4), but not a square.
%t A079896 Select[ Range[148], (Mod[ #, 4] == 0 || Mod[ #, 4] == 1) && !IntegerQ[ 
               Sqrt[ # ]] & ]
%Y A079896 Cf. A014601, A042948 (with squares).
%Y A079896 Sequence in context: A133269 A076635 A116602 this_sequence A133315 A003658 
               A003656
%Y A079896 Adjacent sequences: A079893 A079894 A079895 this_sequence A079897 A079898 
               A079899
%K A079896 nonn,easy
%O A079896 0,1
%A A079896 Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Jan 31 
               2003
%E A079896 More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Mar 26 2003