Question

Reciprocal-totient function, in term of the totient function?

score 231 · Answer 1 · 2026-05-05 13:28:50

231

Views

Reciprocal-totient function, in term of the totient function?

Published on 05 May 2026 - 13:28

score 493 · Answer 2 · 2026-05-05 15:29:04

493

Views

A congruence with the Euler's totient function and sum of divisors function

Published on 05 May 2026 - 15:29

score 80 · Answer 3 · 2026-05-05 11:55:20

80

Views

Identify sequences from OEIS or the literature, or find examples of odd integers $n\geq 1$ satisfying these equations related to odd perfect numbers

Published on 05 May 2026 - 11:55

score 635 · Answer 4 · 2026-05-02 14:26:56

635

Views

For which natural numbers are $\phi(n)=2$?

Published on 02 May 2026 - 14:26

score 163 · Answer 5 · 2026-05-07 16:39:29

163

Views

A congruence with the Euler's totient function and number of divisors function

Published on 07 May 2026 - 16:39

score 64 · Answer 6 · 2026-05-07 07:41:32

64

Views

Does converge $\sum_{n=2}^\infty\frac{1}{\varphi(p_n-2)-1+p_n}$, where $\varphi(n)$ is the Euler's totient function and $p_n$ the $n$th prime number?

Published on 07 May 2026 - 7:41

score 118 · Answer 7 · 2026-04-29 12:16:15

118

Views

On the behaviour of $\frac{1}{N}\sum_{k=1}^N\frac{\pi(\varphi(k)+N)}{\varphi(\pi(k)+N)}$ as $N\to\infty$

Published on 29 Apr 2026 - 12:16

score 188 · Answer 8 · 2026-05-07 14:36:28

188

Views

On the solutions of an equation involving the Euler's totient function that is solved by the primes of Rassias' conjecture

Published on 07 May 2026 - 14:36

score 56 · Answer 9 · 2026-05-07 10:09:11

Are there any known methods for finding Upper/Lower bounds on the number of Totients of x less than another number y?

score 1.3k · Answer 10 · 2026-04-29 12:23:42

1.3k

Views

How is Carmichael's function subgroup of Euler's Totient function?

Published on 29 Apr 2026 - 12:23

score 768 · Answer 11 · 2026-04-29 12:24:04

768

Views

How to solve $\phi(n)=78$?

Published on 29 Apr 2026 - 12:24

score 79 · Answer 12 · 2026-04-29 12:23:42

79

Views

On the equation $\varphi(2+\varphi(x))=2^{y-1}$, where $\varphi(n)$ denotes the Euler's totient function

Published on 29 Apr 2026 - 12:23

score 63 · Answer 13 · 2026-05-02 05:13:09

63

Views

Order of the number of solution to the equation $\phi(x) = n$

Published on 02 May 2026 - 5:13

score 2.5k · Answer 14 · 2026-05-05 09:17:00

2.5k

Views

Solve congruence with large exponents

Published on 05 May 2026 - 9:17

score 51 · Answer 15 · 2026-04-29 12:24:24

51

Views

Prove for non prime $n$ there exists $m \in \mathbb{Z}/n\mathbb{Z} \setminus \{0\}: m^{n-1} \neq 1 \mod n$

Published on 29 Apr 2026 - 12:24

List Question

Reciprocal-totient function, in term of the totient function?

A congruence with the Euler's totient function and sum of divisors function

Identify sequences from OEIS or the literature, or find examples of odd integers $n\geq 1$ satisfying these equations related to odd perfect numbers

For which natural numbers are $\phi(n)=2$?

A congruence with the Euler's totient function and number of divisors function

Does converge $\sum_{n=2}^\infty\frac{1}{\varphi(p_n-2)-1+p_n}$, where $\varphi(n)$ is the Euler's totient function and $p_n$ the $n$th prime number?

On the behaviour of $\frac{1}{N}\sum_{k=1}^N\frac{\pi(\varphi(k)+N)}{\varphi(\pi(k)+N)}$ as $N\to\infty$

On the solutions of an equation involving the Euler's totient function that is solved by the primes of Rassias' conjecture

Are there any known methods for finding Upper/Lower bounds on the number of Totients of x less than another number y?

How is Carmichael's function subgroup of Euler's Totient function?

How to solve $\phi(n)=78$?

On the equation $\varphi(2+\varphi(x))=2^{y-1}$, where $\varphi(n)$ denotes the Euler's totient function

Order of the number of solution to the equation $\phi(x) = n$

Solve congruence with large exponents

Prove for non prime $n$ there exists $m \in \mathbb{Z}/n\mathbb{Z} \setminus \{0\}: m^{n-1} \neq 1 \mod n$

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