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Results tagged with divisors-multiples
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user 38620
For questions on divisors and multiples, mainly but not exclusively of integers, and related and derived notions such as sums of divisors, perfect numbers and so on.
10
votes
2
answers
752
views
Find all $m$ such $2^m+1\mid5^m-1$
The problem comes from a problem I encountered when I wrote the article
Find all positive integer $m$ such
$$2^{m}+1\mid5^m-1$$
it seem there no solution. I think it might be necessary to use qu …
- 4,280
3
votes
1
answer
820
views
Find all positive integers $n$ such that $n+\tau{(n)}=2\varphi{(n)}$
Conjecture：Today I have no intention of thinking about this question. I have only got two solutions so far. I guess there are only two solutions, but I won't prove it.
Let $n$ be positive integers, s …
- 4,280