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In the words of Euclid:
- And, when three numbers having multiplied one another make some number, the number so produced is solid, and its sides are the numbers which have multiplied one another.
A example of a solid number is $12 = 2 \times 2 \times 3$.
Let $m$ and $n$ be solid numbers.
- $m = p_1 \times p_2 \times p_3$ where $p_1 \le p_2 \le p_3$
- $n = q_1 \times q_2 \times q_3$ where $q_1 \le q_2 \le q_3$
Then $m$ and $n$ are similar iff:
- $p_1 : q_1 = p_2 : q_2 = p_3 : q_3$