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Numbers k such that Fib(k) == 21 (mod k).
0

%I #7 Sep 21 2021 13:58:07

%S 1,2,8,56,152,248,488,632,638,872,1112,1178,1208,1448,1592,1688,1832,

%T 1928,2168,2648,2792,3032,3272,3368,3512,3536,3608,3992,4148,4328,

%U 4568,4628,4808,4952,5048,5288,5528,5672,5912,6008,6152,6488,6632,6872,7352

%N Numbers k such that Fib(k) == 21 (mod k).

%K nonn

%O 1,2

%A _David W. Wilson_