1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490
2, 5 and 7 are prime.
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490 = 2 x 5 x 72
The prime factorization for 490 is 7x7x5x2= 490, or 7 to the power of 2 x 5x2
The prime factorization of 245 is 5 x 7 x 7
A composite factor is a factor that is a composite number, as opposed to a prime factor which is a factor that is a prime number.
All numbers have factors. Some factors are prime numbers. These are known as prime factors. Some numbers have some of the same prime factors as other numbers. These are known as common prime factors. 3 is a common prime factor of 12 and 15.