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%I #12 Jul 06 2024 15:57:00
%S 443,451,459,463,467,479,487,491,499,503,511,523,527,1768,1832,1856,
%T 1888,1920,1952,2048,2080,2112,3975,4035,4119,4191,4395,4479,4611,
%U 4695,4755,7064,7128,7256,7432,7512,7576,7688,7704,7768,7816,8072,8152,8408,8456
%N Numbers k such 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 21.
%K nonn
%O 1,1
%A _David W. Wilson_
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