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The least common multiple of some integers is usually written as \([a,b,...]\) or \(lcm(a,b,...)\), which means the smallest positive number that can divisible by \(a,b,...\)

for example:

\(lcm(6,8)=24\)

\(lcm(2,5,7)=70\)

（sorry for my bad English...)

\(lcm(1,2,3,...,42)\) = ?

\(lcm(1,2,3,...,42)\) = ?