The GCF is 41.
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41, 82, 123, 164, 205, 246, 287, 328, 369, 410, 451, . . .
1, 3, 7, 9, 21, 41, 63, 123, 287, 369, 861, 2583.
280 and 287
369 is composite because 3 and possibly other numbers besides 1 and 369 are factors of 369.
287