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Numbers k such that the continued fraction sequence of sqrt(k) is not multiplicative.
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%I #14 Jul 13 2021 06:24:41

%S 2,5,6,10,11,12,17,18,19,20,21,26,27,28,29,30,31,37,38,39,40,41,42,43,

%T 45,46,50,51,52,53,54,55,56,57,61,65,66,67,68,69,70,71,72,73,76,77,82,

%U 83,84,85,86,87,88,89,90,91,92,93,94,97,101,102,103,104,105,106,107

%N Numbers k such that the continued fraction sequence of sqrt(k) is not multiplicative.

%e The continued fraction of sqrt(21) is (4; 1, 1, 2, 1, 1, 8, ...) = A010125, which is not multiplicative since c(2) = 1, c(3) = 2, but c(6) = 8.

%Y Complement of A109054.

%K nonn,easy

%O 1,1

%A _Mitch Harris_, Jun 20 2005