The GCF is 3.
The GCF is 19.
38, 76, 114, 152, 190, 228, 266, 304, 342, 380, 418, . . .
The GCF is 38.
The GCF is 76.
GCF(38, 76, 114) = 38.
19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247, 266, 285, 304, 323, 342, 361, 380.
If that's 76, 21 and 14, the GCF is 1. If that's 762 and 114, the GCF is 6.
38, 76, 114, 152, 190, 228, 266.
38, 76, 114, 152, 190, 228, 266, 304
38, 76, 114, 152, 190, 228, 266, 304, 342 . . .
The GCF is 38.