It is: 2*2*5*7 = 140 by dividing it by each Prime number that has no remainder
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Least Common Multiple (LCM) for 42 140 is 420.
it is 14
22 x 51 x 71
23 is already prime.
all the numbers are prime numbers therefore the prime factorization of 2*2*5*11=2*2*5*11