13 and 2
12 and 3
The two consecutive numbers whose factors have the same sum are 8 and 9. The factors of 8 are 1, 2, 4, and 8, and their sum is 15. The factors of 9 are 1, 3, and 9, and their sum is also 15. Therefore, 8 and 9 are the consecutive numbers whose factors have the same sum.
1 + 15 + 3 + 5 = 24
1, 3, 5, 9, 15, 45 (sum = 78).
That means that the sum of the number's factors, less than the number itself, is less than the number in question - in this case, if you add the factors of 15 (except 15 itself, which is also a factor of 15), you get a total that is less than 15.
5 and 3.
Six.
13
The Answer is 8 because... 1+2+4+8=15
60
9
2 and 15 5 and 12
1 + 3 + 5 + 15 = 24