Just 17.
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3*17 = 51
17, 31 and 23 are.
3 and 17
51 = 3 x 17 Both 3 and 17 are prime numbers.
No, 41, 51, 71, 81, and 91 are not prime numbers. A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. In this case, all the numbers listed can be divided by numbers other than 1 and themselves, making them composite numbers.