101
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2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
2, 3, 5, 7, 11, 13, 17, 19, 23, 29. 31, 37, 41, 43, 47, 53, 59, 61, 67, 71. 73, 79, 83, 89, 97
The prime numbers between 2 and 100 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97.
Each of them has an infinite number of multiples so there is simply not enough time nor space to answer the question.
2 and 5
There are two numbers, 7 and 49, whose smallest prime factor is 7 in the set of numbers from 1 to 100.
Prime factorization refers to whole numbers, not fractions. 100/50 = 2, which is already prime and therefore has no prime factorization other than itself.
Usually, but not necessarily and not if they're prime. All prime numbers have the same number of factors.
The only factor common to all those numbers is 1.