%I #10 Aug 17 2021 23:48:27
%S 402,418,422,446,454,466,478,482,903,921,933,939,942,948,993,1014,
%T 1029,1041,1047,1077,1086,1604,1612,1636,1644,1660,1676,1684,1700,
%U 1708,1724,1732,1740,1756,1772,1780,1788,1796,1804,1820,1828,1836,1844,1852,1868
%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 20.
%K nonn
%O 1,1
%A _David W. Wilson_
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