Because you don't have to test for anything above 1/2 the number... 2 is the lowest divisible number to check for. Saves computing time.
By accounting for lines with mutliple markers, right?
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Because you don't have to test for anything above 1/2 the number... 2 is the lowest divisible number to check for. Saves computing time.
By accounting for lines with mutliple markers, right?