Is 10 a friendly number?
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2
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27%
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1W
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ALL
Letting σ(n) be the sum of the factors of n, a number n is considered "friendly" if there is some m ≠ n such that σ(n)/n = σ(m)/m. Non-friendly numbers are called solitary. It is currently not known whether 10 is friendly or solitary.
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