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43
6
The 15 twin prime numbers between 1 and 100 are in 8 pairs. The twin prime pairs are (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), and (71, 73).
There are 35 pairs of twin prime numbers totaling 69 numbers (prime number 5 appears twice in the twin pairs) between 0 and 1000.
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420 has four prime factors. Prime factors don't usually travel in pairs.
There are two pairs of prime numbers that express 18 as the sum of two prime numbers: 7 + 11 = 18 and 5 + 13 = 18.
There are three pairs.
6
The 15 twin prime numbers between 1 and 100 are in 8 pairs. The twin prime pairs are (3, 5), (5, 7), (11, 13), (17, 19), (29, 31), (41, 43), (59, 61), and (71, 73).
41,2
One. 997 and 2
Eight pairs.