How about: 4 and 5
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2 and 20
3 and 17
The Least Common Multiple (or Lowest Common Multiple) of a group of numbers, called the LCM, is the smallest number that's a multiple of all the numbers. For instance, the LCM of 16 and 20 is 80; 80 is the smallest number that's both a multiple of 16 and a multiple of 20.
20 and 30 among others
20 and 20.