2 x 5 x 7 = 70
No exponents required.
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The Prime Factorization for 70 is 7 x 5 x 2
2 x 5 x 7 = 70
Looks like 70, 490 = 7 x 70, 630 = 9 x 70 and 7 and 9 are co-prime.
140 = 2 * 2 * 5 * 7 700 = 2 * 2 * 5 * 5 * 7
For 70 it is: 2, 5 and 7 For 90 it is: 2, 3, 3 and 5