The least common multiple of 16 and 19 is their product, 304. The numbers are co-prime, i.e. have no common factor, so the LCM is their product.
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The LCM of 19 and 38 is 38
Their product.
3496
LCM(36, 47, 19) = 32148
The least common factor of any set of numbers is 1.