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Anonymous
3 * 17 = 51
51 has 4 factors: 1, 3, 17, and 51.
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31 is prime, but 51 is not as 51=3*17.
51 is not a prime number: 3x17=51
51 composite, 61 prime.
47, yes. 51, no.
Yes, 11 and 51 are relatively prime.