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There are 11 numbers between 1 and 130 that have an odd number of factors: 1,4,9,16,25,36,49,64,81,100,121.
That number is 36.
These numbers between 1 and 40 have an odd number of factors: 4, 9, 16, 25, 36.
There are 101 numbers between 0 and 100. Because it starts with an even number and ends with an even number, there is 1 less odd number than even. So 51 even and 50 odd.
27 is an odd number.