The number 203 and 205 have no common factors.
203 = 7 x 29
205 = 5 x 41
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Any of its factors which are: 1, 7, 29 and 203
205 ends in the digit 5, so it is obviously divisible by 5. 205/5 = 41 41, like 5, is a prime number which can only be divided without a remander by itself and 1. So the answer is 5 and 41 (and of course 1, which "goes into" all numbers.
The only two numbers that go into 18 and 50 evenly are one and two.
It is a pattern. Go up two numbers, go down two numbers.
The two whole numbers that go into 500 evenly are 1, 2, 5, 10, 20, 25, 50, 100, 250, and 500 .