9
The product of the first twelve prime numbers, 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, can be written down by using no figures but 0, 1, 2, and 3, and of these 2 and 3 once only, thus—
10 × 1001 × 2001 × 10013:—
or
10 = 1 × 2 × 5
1001 = 7 × 11 × 13
2001 = 3 × 23 × 29
10013 = 17 × 19 × 31
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