What numbers under 100.prime have 3 prime factors?

Answer 1

Numbers under 100 with three different prime factors are 30, 42, 66, 70 and 78.

Numbers under 100 with three different prime factors, at least one of which has multiplicity > 1 are 8, 12, 18, 20, 27, 28, 44, 45, 50, 52, 63, 68, 75, 76, 92, 98 and 99.

Answer 2

They are:

8, 12, 18, 20, 27,

28, 30, 42, 44, 45,

50, 52, 63, 66, 68,

70, 75, 76, 78, 92,

98, 99.

There are some that have more than 3 - which means that they do have 3.

[That last part is like the old riddle: how many months have 28 days - and the answer is all of them. Eleven have more than 28, but they do have 28.]