Here are all 12: 1 3 9 11 13 33 39 99 117 143 429 1287.
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1and itself, this number is a prime number
One and two will go into both numbers evenly leaving no remainders.
A single number, 20, does not have a lowest common multiple! So there are no two numbers to go in.
There is only one number that can go into both 5 and 6 evenly. That number is 1.
1 and 61 because 61 is a prime number.