23 x 5 x 7
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280 = 2 x 2 x 2 x 5 x 7
2 x 2 x 2 x 5 x 7 = 280
The prime factorization of 280 is: 2 x 140 2 x 2 x 70 2 x 2 x 2 x 35 2 x 2 x 2 x 5 x 7. The three prime factors of 280 are 2, 5, 7.
They are both not prime
The prime factor tree of 280 is:140,270,2,235,2,2,27,5,2,2,2