25 of them.
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There are eight twin primes between 1 and 100. They are (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), and (71, 73).
Answer: 1, and that is 2?Answer: The only even prime number - nont only between 1 and 100, but among all the prmes - is 2. All higher even numbers are divisible by 2, and therefore not primes.
25 primes.
101
There are 19 primes.