no, the GCF is 19.
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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.
22 is not relatively prime
148
yes, they are relatively prime.
19, 38, 57, 76, 95, 114, 133, 152, 171, 190 . . .