2's
Mary Ann wrote the decomposition into prime factors of the natural numbers from 2 to 100:
2,\quad 3\quad ,2\times 2,\quad 5,\quad 2×3,\quad ...,\quad 3\times 3\times 11,\quad 2×2×5×5.
How many times did she write the number 2?
The answer is 104.
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