79 is prime.
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68 is not prime. 68 = 2 * 2 * 17
The sum of the prime numbers 2, 5, and 61 is 68.
2)68 2)34 17)17 = 1 Hence '17' is the greatest prime number factor of '68'.
61 is the first prime number greater than 60.
The GCF of 42 and 68 is 2