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The divisors of a number are the positive whole numbers that divide into it evenly. For example the divisors of 6 are: 1, 2, 3, and 6.

Notice that 6 has four divisors. If you count how many divisors the number has your answer might be even (6 has 4 divisors) or it might be odd (1 has only 1 divisor, namely itself). How many of the numbers from 1 to 400 have an odd number of divisors?

 Jul 6, 2018
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Did you look under yesterday's post of the same question??

 Jul 6, 2018

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