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25 of them.
There are four pairs of twin primes between 2 and 35: (5,7) (11,13) (17,19) (29,31).
99 = 2 100 to 999 = 900 x 3 = 2700 1000 to 1999 = 1000 x 4 = 4000 2000 to 2999 = 1000 x 4 = 4000 3000 = 4 10,706
There are 19 primes.
There are 731 pairs.