%I A013647
%S A013647 2,5,6,10,11,12,17,18,20,26,27,28,30,37,38,39,40,41,42,50,51,55,56,65,
               66,
%T A013647 68,72,82,83,84,87,89,90,101,102,104,105,110,122,123,126,128,130,131,132,
%U A013647 145,146,147,148,150,152,155,156,170,171,174,177,180,182,197,198,200,203
%N A013647 Period of continued fraction for sqrt(n) contains no 1's.
%D A013647 Kenneth H. Rosen, Elementary Number Theory and Its Applications, Addison-Wesley, 
               1984, page 426 (but beware of errors!).
%Y A013647 Sequence in context: A112967 A109150 A004202 this_sequence A077471 A064572 
               A032399
%Y A013647 Adjacent sequences: A013644 A013645 A013646 this_sequence A013648 A013649 
               A013650
%K A013647 nonn
%O A013647 1,1
%A A013647 Clark Kimberling (ck6(AT)evansville.edu)