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Themselves and one because 3 and 7 are prime numbers
The three prime numbers that go into 231 are 3, 7 and 11.231 = 3 x 7 x 11
They are: 3 and 7
3 and 7
2100
1, 3, 7, 21.
1 ,3 ,7 ,21
1, 3, 7 and 21. Four numbers.
3 x 3 x 7 x 7 = 441
1, 3, 7 and 21
3 and 119 7 and 51