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amicable numbers

An amicable number belongs to a pair of distinct numbers where each is the sum of the proper divisors of the other.

The first few amicable numbers are: 220, 284, 1184, 1210, 2620, 2924, 5020, 5564, 6232, 6368, 10744, 10856, …

82 of the first one million positive integers are amicable.

Learn more about amicable numbers on wikipedia.

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