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15
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If $(r,s)=1$, then $\phi(rs)=\phi(r)\phi(s)$

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#abstract-algebra #group-theory #elementary-number-theory #finite-groups #totient-function
152
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How to find this LCM sum function? $ \text{lcm}(m,n) +\text{lcm}(m+1,n) +\cdots+\text{lcm}(n,n)$

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#sequences-and-series #number-theory #summation #totient-function
245
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Calculate $ \sum_{k=1}^{n} k\cdot\varphi(k) $

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#summation #computational-complexity #computational-mathematics #totient-function #computational-number-theory
58
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I only don't understand one line in this given proof regarding a sequence becoming constant modulo n

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#elementary-number-theory #modular-arithmetic #totient-function
145
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Growth rate of $(p-1)/\phi(p-1)$ for large primes

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#number-theory #prime-numbers #totient-function
706
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Almost exact formula for sum of Euler Phi function $\sum_{k=1}^n \varphi(k)$

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#number-theory #summation #totient-function #arithmetic-functions
407
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Surjectivity of $a^x+x\pmod n$.

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#elementary-number-theory #totient-function
88
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Proving the Euler totient function (product formula)

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#combinatorics #totient-function
32
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Remainder of nested exponents problem

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#elementary-number-theory #integers #totient-function
108
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On a conjecture involving multiplicative functions and the integers $1836$ and $136$

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#elementary-number-theory #divisibility #totient-function #divisor-sum #multiplicative-function
139
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On a conjecture involving multiplicative functions and the integers $1836$ and $137$

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#elementary-number-theory #divisibility #totient-function #divisor-sum #multiplicative-function
106
Views

Proving $\sigma_1(n) \phi(n)>n/2$

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#number-theory #totient-function
79
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Proving a natural odd number n is prime based on constraints on order of numbers mod n

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#elementary-number-theory #modular-arithmetic #totient-function
63
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Problem on the totient function and the divisor function

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#number-theory #totient-function
194
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Modular tetration (power tower) for non-coprime numbers case

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#elementary-number-theory #exponentiation #totient-function #tetration

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