The LCM of 42, 23, 31, 19 is: 568,974.
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The LCM is 1302.
Answer: (5 & 37), (11 & 31), (13 & 29), (19 & 23)
19
The prime numbers from 1 to 42 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, and 41.