One of the mysteries of the English language finally explained.
A pair of numbers, each of which is the sum of the factors of the other (e.g. 220 and 284).
- ‘One particular interest involved what we now call amicable numbers.’
- ‘The Pythagoreans were also interested in what we now call amicable numbers - pairs in which each number is the sum of the proper divisors of the other.’
- ‘Today, the tally of known amicable numbers has grown to about two and half million.’
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