2 and 5
You can find a chart in the Wikipedia article on "sunspot".
It is: 100
the only factors of 180 greater than 50 but least than 100 is 60 and 90 =)
11,22,33,44,55,66,77,88,99
180, which has 18 factors.
10x10=100 numbers
I wrote out all the factors of all the numbers from 1 to 100 and counted them.
All of the numbers from 1 to 100 are the factors in the set of numbers from 2 to 100.
784874874
50 of them.
60, 72, 84, 90, and 96 each have 12 factors.
The factors of all of the numbers from 1 to 100 are all of the numbers from 1 to 50.
It is one of 5 numbers.
On a chart with 1-100, highlight or color the boxes of numbers that are prime.
60, 72, 84, 90 and 96 each have twelve factors.
60, 72, 84, 90 and 96 all have 12 factors.