%I #7 Sep 21 2021 13:54:54
%S 1,2,4,11,16,22,112,136,184,376,424,664,682,856,904,1096,1288,1336,
%T 1384,1576,1816,1864,2056,2104,2344,2536,2584,2776,2824,3016,3064,
%U 3472,3544,3736,4024,4402,4456,4504,4696,4744,4936,5176,5224,5332,5416,5464,5944
%N Numbers k such that Fib(k) == -21 (mod k).
%K nonn
%O 1,2
%A _David W. Wilson_
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