3, 5 and 11
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8 has three primes (2x2x2) in its factorization, and 30 is the smallest number having three different primes (2x3x5) in its factorization.
The largest three digit prime number whose digits are all primes is 773.
The smallest prime factor of 195 is three.
smallest 3-digit prime is 101. 100 is not a prime number (very obviously)
The smallest prime number that divides 147 evenly is three (3).