There are infinitely many ways to continue the pattern but I am not sure any of them actually finishes it.
The simplest, linear rule is
Un = 28 - 4*n for n = 1, 2, 3, ... but that does not "finish" it since it goes on forever.
Or, you could fit the cubic:
Un = (8x3 - 48x2 + 76x + 36)/3 for n = 1, 2, 3, ... but that also does not "finish" it.
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The least common multiple of the numbers 20, 16 and 24 is 240.
The first 4 multiples of 4 are: 4, 8, 12, and 16.
The modes are 4 and 16. The median is 16. The average is 16.
The Greatest Common Factor fo 20 and 24 is 4. This is because 4x5=20 and 4x6=24.
20: 1, 2, 4, 5, 10, and 20 48: 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48