Both 61 and 67 are prime numbers themselves, therefore their factors are 1 and themselves, which are obviously both prime as well.
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61, 67.
61 is the prime number before 67.
There are 5 prime numbers from 60 to 80:61, 67, 71, 73 and 79
61, 67, 71, 73, 79.
The prime numbers between 60 and 80 are 61, 67, 71, and 73.