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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?

Guest Jul 6, 2018