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untouchable number
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English
Wikipedia
has an article on:
untouchable number
Wikipedia
Noun
edit
untouchable
number
(
plural
untouchable numbers
)
(
mathematics
)
A
positive
integer
that cannot be expressed as the
sum
of all the
proper
divisors
of any positive integer (including the untouchable number itself).
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:
English lemmas
English nouns
English countable nouns
English multiword terms
en:Mathematics
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