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A031517 that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 19. 0

%I

%S 363,367,379,383,387,391,411,419,431,439,1448,1480,1536,1568,1576,

%T 1632,1664,1696,1728,1760,3255,3327,3387,3543,3687,3747,3759,3819,

%U 3831,3903,3963,5784,5912,5976,6152,6168,6232,6296,6424,6488,6616,6744,6872,6936

%N that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 19.

%K nonn

%O 1,1

%A _David W. Wilson_

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Last modified May 26 17:16 EDT 2022. Contains 354092 sequences. (Running on oeis4.)