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Q: What number less than 19 has more than 4 factors?

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Any number less than 100 which has more than 2 factors is a composite number

36

No positive integer less than 19 has more factors than 28 does.

If you're allowed to repeat factors, 2 x 2 x 2 x 2 = 16. If not, no number less than 100 has more than 3 distinct prime factors.

It is: 299 which has more than 2 factors

25

48

In that range, 12 and 18 are tied with six factors apiece.

There are 12 numbers less than 150 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100,121,144.

99 is one of them and all other numbers less than 100 that have more than two factors in them.

There are 10 numbers less than 101 which have an odd number of factors: 1,4,9,16,25,36,49,64,81,100.

A number with more than two factors is composite

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