The prime numbers (factors) of 80 are: 2 and 5
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Prime numbers between 71 to 80 = 73 and 79 Therefore there are 2 prime numbers between 71 to 80.
The numbers 83, 89 and 97 are prime.
The only number that equals 80 is 80, and it's not a prime number.
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Prime numbers between 80 and a 100 are: 83, 89 and 97