Let's see
So there are 11 numbers from 1-100 that have a 3.
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5
The sum of 2 and 97 is 99.
1, 3, 5, 7, 9, 11 and just keep adding 2 until you get to 99.
They are the numbers that have more than two factors
The sum of all odd numbers from 1 to 64 inclusive is 4,096