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    Well I'm impressed of your solution to find LCM totally efficient way congrats!

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    My code works well for all tests except tests 14, 15 and 5.
    Lets take test 5 as sample.
    for n = 151042752, I entered from p=1 to p=17 where the calculated number reaches upper limit of Long. And among these p inputs; I've never get 3263 which the number I got from the error of code's attempt output instead of -1 this made me confused please help. Same thing for test 14 and 5.

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