%I

%S 7,13,14,19,21,22,23,29,31,32,33,34,43,44,45,46,47,52,53,54,57,58,59,

%T 60,61,62,67,69,70,71,73,74,75,76,77,78,79,85,86,88,91,92,93,94,95,96,

%U 97,98

%N Period of continued fraction for sqrt(n) contains at least two 1's.

%D Kenneth H. Rosen, Elementary Number Theory and Its Applications, Addison-Wesley, 1984, page 426 (but beware of errors!).

%K nonn

%O 1,1

%A _Clark Kimberling_