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The GCF is 3.
19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247, 266, 285, 304, 323, 342, 361, 380.
1, 2, 3, 6, 19, 38, 57, 114
Factors of 114 = 1, 2, 3, 6, 19, 38, 57, 114.
(114) = 2 * (57) = 3 * 19 (both primes, end.) so prime factors are 2,3,19