4, 9, 25, 49
4 has 1, 2, 4
9 has 1, 3, 9
25 has 1, 5, 25
49 has 1, 7, 49
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4, 9 and 25.
Numbers with exactly three factors are squares of prime numbers.
4? the factors of 4 are 1,4 and 2
Numbers with three factors are squares of primes. So: 4, 9, 25
The LCM of the given three numbers is 24