Henry Ernest Dudeney/Modern Puzzles/93 - Sum Equals Product

Modern Puzzles by Henry Ernest Dudeney: $93$

Sum Equals Product

There are two numbers whose sum equals their product, that is, $2$ and $2$.

What other numbers have that property?

The original of this question was wordy to the max, and has been minimised for this presentation.

Sources

• 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Arithmetical and Algebraical Problems: Various Arithmetical and Algebraical Problems: $93$. -- Sum Equals Product
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Miscellaneous Puzzles: $176$. Sum Equals Product