There are 22 prime numbers, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, and 79, between 1 and 80.
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Prime numbers between 71 to 80 = 73 and 79 Therefore there are 2 prime numbers between 71 to 80.
Two.
5
141
Prime numbers between 80 and a 100 are: 83, 89 and 97