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Talk:Perfect totient numbers: Difference between revisions
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(Why isin't 1 a perfect totient number ?) |
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==Why is 1 excluded==
Hi, could someone explain why 1 is not a perfect totient number ? --[[User:Tigerofdarkness|Tigerofdarkness]] ([[User talk:Tigerofdarkness|talk]]) 14:22, 13 November 2021 (UTC)
== Answer ==
We are to count the number of times the totient must be applied before 1 before we reach 1.
If we begin with n=1, then since we already are at 1, we must apply the totient 0 times.
However totient(1) = 1 not 0, so 1 is not a perfect totient number.
[[User:Soegaard]
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