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The GCF of 86 and 154 is 2. 86=2x43 154 = 2x7x11 Now the GCF is 2 since 43 does not occur in the prime factorization of 154 and 7 and 11 do not appear in the prime factorization of 86.
Eleven numbers less than 105 are relatively prime to 105. They are 82, 83, 86, 88, 89, 92, 94, 97, 101, 103, and 104.
They seem to mean that 97 is a prime number whereas the rest of them are composite numbers.
86 is not a prime number, so is a composite.
86 = 2 x 43 Thus, the two prime factors of 86 are 2 and 43.