(3 & 5), (5 & 7), (11 & 13), (17, & 19)
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2 x 3 x 5 x 7 = 210 11 + 13 + 17 + 19 = 60 The difference is 150 .
There are no prime numbers at all between 10.
The prime numbers between 1 and 10 are 2, 3, 5, and 7.
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
Not necessarily. 71 is a prime number, 7 is a prime number, and 71-7= 64, which is NOT a prime number. In most cases, the difference of two prime numbers will not be a prime number. All prime numbers greater than 2 will be odd numbers. The difference between two odd numbers will be an even number. Unless that even number is 2, it is not a prime number. Here are some additional examples: 19, 13: difference 6, not prime 23, 7: difference 16, not prime 53, 31: difference 22, not prime 61, 59: difference 2, prime 113, 109: difference 4, not prime 293, 283: difference 10, not prime 331, 101: difference 230, not prime