998
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If the question refers to the prime factors of 999 then these are 33 and 37. If the question refers to the number of prime numbers between 1 and 999 then there are 168.
1 to 999
2,3,5,7,11,13,17,19,23,27,29,31,37,41,....
Well.. There are 899 999 numbers between 100,000 & 999 999, so basically pick any6 positive whole numbers (1-9) and mix them up. Do this three times, ta da!
3437- 2437 - 1 = 999