15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300,
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15 & 20 have an infinite number of Common Multiples; the first three are 60, 120 and 180.
5, 10, 15, 20
Leaving out non-positive multiples, the answer is 5, 10, 15 and 20.
5 10 15 20
20=20,40,60,80,100,120,140 15=15,30,45,60,75,90,105 12=12,24,36,48,60,2,84 8=8,16,24,32,40,48,56