If the two numbers have no factors in common then they are relatively prime.
152 = 2 x 2 x 2 x 19
171 = 3 x 3 x 19.
They both have 19 as a factor and therefore 152 and 171 are NOT relatively prime.
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no, the GCF is 19.
22 is not relatively prime
148
yes, they are relatively prime.
19, 38, 57, 76, 95, 114, 133, 152, 171, 190 . . .