%I A039957
%S A039957 3,7,11,15,19,23,31,35,39,43,47,51,55,59,67,71,79,83,87,91,95,103,
%T A039957 107,111,115,119,123,127,131,139,143,151,155,159,163,167,179,183,
%U A039957 187,191,195,199,203,211,215,219,223,227,231,235,239,247,251,255
%N A039957 Square-free numbers congruent to 3 mod 4.
%C A039957 Negative of odd fundamental discriminants D := b^2-4*a*c<0 of definite 
               integer binary quadratic forms F=a*x^2+b*x*y+c*y^2. See Buell reference 
               pp. 224-230. See 4*A089269 for the even case and A003657 for combined 
               even and odd numbers. - Wolfdieter Lang, Nov 07 2003
%D A039957 R. A. Mollin, Quadratics, CRC Press, 1996, Tables B1-B3.
%D A039957 D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989.
%Y A039957 Cf. A039955, A039956.
%Y A039957 Sequence in context: A004767 A131098 A118894 this_sequence A079422 A022797 
               A109507
%Y A039957 Adjacent sequences: A039954 A039955 A039956 this_sequence A039958 A039959 
               A039960
%K A039957 nonn,easy,nice
%O A039957 0,1
%A A039957 R. K. Guy (rkg(AT)cpsc.ucalgary.ca)