%I A003654 M1366
%S A003654 2,5,10,13,17,26,29,37,41,53,58,61,65,73,74,82,85,89,97,101,106,109,113,
%T A003654 122,130,137,145,149,157,170,173,181,185,193,197,202,218,226,229,233,
%U A003654 241,257,265,269,274,277,281,290,293,298,313,314,317,337,346,349,353,362
%N A003654 Fundamental unit of Q(sqrt(n)) has norm -1; also square-free n such that 
               Pell equation x^2 - n y^2 = -1 is soluble.
%C A003654 The square-free elements of A003814. [From Max Alekseyev (maxale(AT)gmail.com), 
               Jun 01 2009]
%D A003654 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A003654 D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241.
%H A003654 S. R. Finch, <a href="http://algo.inria.fr/bsolve/">Class number theory</
               a>
%Y A003654 Cf. A031396, A031397, A003814.
%Y A003654 Sequence in context: A145017 A003814 A031396 this_sequence A047617 A135467 
               A018571
%Y A003654 Adjacent sequences: A003651 A003652 A003653 this_sequence A003655 A003656 
               A003657
%K A003654 nonn
%O A003654 1,1
%A A003654 N. J. A. Sloane (njas(AT)research.att.com), Mira Bernstein