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The only odd untouchable (
Posted on 2016-04-12
)
An untouchable number is a positive integer that is not the sum of the proper divisors of any number(see OEIS A005114).
It is thought that 5 is the only odd untouchable number.
Why?
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Submitted by
Ady TZIDON
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Subject
Author
Date
Goldbach Solution
Brian Smith
2016-04-12 12:37:55
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