1) The product of those numbers
2) Any multiple of point (1)
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10, 20 or 30 (and indeed every multiple of 10) has factors of "2" & "5" (amongst others).
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Factors of 6: 1, 2, 3, 6 Factors of 15: 1, 3, 5, 15
1: 1 2: 1, 2 (2 is prime.) 3: 1, 3 (3 is prime.) 4: 1, 2, 4 (2 is prime.) 5: 1, 5 (5 is prime.) 6: 1, 2, 3, 6 (2 and 3 are prime.) 7: 1, 7 (7 is prime.) 8: 1, 2, 4, 8 (2 is prime.) 9: 1, 3, 9 (3 is prime.) 10: 1, 2, 5, 10 (2 and 5 are prime.)
1, 2 and 4 are the factors of 4.1 and 5 are the factors of 5.A factor is a number by which a given number is divisible. 5-1,5.4-1,2,4 1, 2, 41, 51, 2, 41, 5
A number with two prime factors that are not the same will have only four factors. It will have 1, itself, and those two prime factors as its factors. Examples: 6 = 2 x 3. Its factors are 1, 2, 3, and 6. 15 = 3 x 5. Its factors are 1, 3, 5, and 15. 77 = 7 x 11. Its factors are 1, 7, 11, and 77. Counter-examples: 4 = 2 x 2. Its factors are 1, 2, and 4. 12 = 2 x 2 x 3. Its factors are 1, 2, 3, 4, 6, and 12. 30 = 2 x 3 x 5. Its factors are 1, 2, 3, 5, 6, 10, 15, and 30. 45 = 3 x 3 x 5. Its factors are 1, 3, 5, 9, 15, and 45.