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1 and 2
Both 7 and 11 are prime numbers. Each one has no other factors besides '1' and itself.So the only factor they have in common is ' 1'.(Even if you had picked 2 numbers with 100 factors in each one, you asked for the "least"common factor. Regardless of what the numbers may be, that's always ' 1 '.)
All nonzero numbers have factors. Some numbers have some of the same factors as other numbers. These are common factors. All nonzero numbers have 1 as a factor. The least common factor of any set of positive integers is 1.
The greatest common factor, or GCF, is the largest positive integer that will divide evenly with no remainder into all the members of a given set of numbers. The least common multiple, or LCM, is the smallest positive integer that all the members of a given set of numbers will divide into evenly with no remainder. Factors go into numbers, numbers go into multiples.
Co-prime numbers, relatively prime numbers and any set of prime numbers.