factors: 1, 3, 5, 15, 23, 69, 115, 345
prime factors: 3, 5, 23
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The LCM (Least Common Multiple) of 115 and 15 is 345. The prime factors of 115 are 5 and 23. The prime factors of 15 are 3 and 5. Multiply the smallest encountered number of same factors, 3, 5, and 23, to get 345.
The factors of 3105 are: 1, 3, 5, 9, 15, 23, 27, 45, 69, 115, 135, 207, 345, 621, 1035, 3105. The prime factors are: 3, 5, 23.
Composite
345 3 x 115 3 x 5 x 23 345 = 3 x 5 x 23
By any of its factors including itself