490 = 2 x 5 x 7 x 7
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The prime factorization for 490 is 7x7x5x2= 490, or 7 to the power of 2 x 5x2
490 = 2 x 5 x 72
The prime factorization of 245 is 5 x 7 x 7
1, 2, 5, 7, 10, 14, 35, 49, 70, 98, 245, 490 2, 5 and 7 are prime.
Looks like 70, 490 = 7 x 70, 630 = 9 x 70 and 7 and 9 are co-prime.