00:01
To find out prime factorization of 47.
00:05
So let's see which number divides 47.
00:08
Well, there is apart from 1 and 47 because 1 and 47 divide 47.
00:16
So 47 is odd.
00:21
It's an odd number.
00:26
So only odd numbers can divide odd numbers.
00:30
No even number divides an odd number.
00:36
Okay, so let's start from 3.
00:38
So 4 plus 7 is 11 11 is and 1 plus 1 is 2 and 3 does not divide 2 so 3 does not divide 47 because for a number to divide 47 for a number to be divisible by 3 the sum of some of its digits have to be divisible by 3 so it's not the case so 3 doesn't divide 47 so next we go to 5 but 47 ends with 7 so 5 doesn't divide 47 next is 7 so let's see so 7 times 6 is 42 and the next entry in the multiplication table is 49 so 7 doesn't divide 47 either so next we go to 9 but again for a number to be divisible by 9 it's the sum of its digits have to be divisible by 9 but 9 doesn't divide 2 so 9 doesn't divide 47 so next we go to 11.
01:43
So again 11 times 4 is 44 and the next entry in its multiplication table is 55.
01:53
So 11 doesn't divide 47 either.
01:57
So next we go to 13.
01:59
So let me open a page...