There are only 999 three digit whole numbers.
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90000
There are no three-digit numbers that equal 17. In fact, there are no numbers with more or less than two digits that equal 17. In fact, in the whole infinite supply of numbers, there is only one single number that equals 17. That number is . . . . . . . 17 .
4,536 whole numbers or mixed numbers. 5,040 pure decimals.
102 = 100 which is the first possible three digit number that is a perfect square. 312 = 961 which is the last possible three digit number that is a perfect square. So there are 22 three digit positive numbers that are perfect squares.
27 three digit numbers from the digits 3, 5, 7 including repetitions.