1019, 1021
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There are 168 prime numbers between 1 & 1000.
Prime No: between 1000 to 9999= 54_( 42x3)
There are 35 pairs of twin prime numbers totaling 69 numbers (prime number 5 appears twice in the twin pairs) between 0 and 1000.
168.
The prime numbers (factors) of 1000 are: 2 and 5