Question

Is this quadratic form of any use to rule out ec-numbers to be prime?

score 66 · Answer 1 · 2026-03-24 20:33:24

66

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Is this quadratic form of any use to rule out ec-numbers to be prime?

Published on 24 Mar 2026 - 20:33

score 97 · Answer 2 · 2018-04-07 17:18:52

97

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How can I prove my answer about prime numbers is the only obvious answer?

Published on 07 Apr 2018 - 17:18

score 364 · Answer 3 · 2026-03-26 06:08:13

364

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Take p an odd prime and $a$ an integer with order $d$ mod p, is it true that if $d$ is even, then $a^{\frac{d}{2}} \equiv -1\pmod p$

Published on 26 Mar 2026 - 6:08

score 235 · Answer 4 · 2026-03-23 07:14:57

235

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Is $n^2 - n + 1$ prime infinitely often?

Published on 23 Mar 2026 - 7:14

score 154 · Answer 5 · 2018-04-08 06:09:42

154

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Is there a sequence producing almost all primes?

Published on 08 Apr 2018 - 6:09

score 300 · Answer 6 · 2026-03-25 04:25:15

300

Views

Number theory question involving Wilson's theorem. How to solve??

Published on 25 Mar 2026 - 4:25

score 142 · Answer 7 · 2026-03-29 03:38:39

142

Views

What about sequences $\{\sum_{k=1}^n (\operatorname{rad}(k))^p\}_{n\geq 1}$ containing an infinitude of prime numbers, where $p\geq 1$ is integer?

Published on 29 Mar 2026 - 3:38

score 132 · Answer 8 · 2026-03-27 19:55:13

132

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Is $n=13$ the only solution to this: $\pi\left(\sum_{i=1}^n\pi(i)\right)-1=n$.

Published on 27 Mar 2026 - 19:55

score 56 · Answer 9 · 2018-04-09 15:55:48

56

Views

asymptotic bound on number of primes from 1 to n

Published on 09 Apr 2018 - 15:55

score 208 · Answer 10 · 2018-04-09 17:48:19

208

Views

What is the set of all positive integers that can make a cuboid? Is there anything special about it?

Published on 09 Apr 2018 - 17:48

score 151 · Answer 11 · 2018-04-09 17:54:57

151

Views

sum of the primes with even indices and with odd indices

Published on 09 Apr 2018 - 17:54

score 304 · Answer 12 · 2018-04-09 18:31:44

304

Views

Closest lower-bound on the prime counting function

Published on 09 Apr 2018 - 18:31

score 69 · Answer 13 · 2026-03-23 04:02:44

69

Views

Which primes can never divide an "ec"-number?

Published on 23 Mar 2026 - 4:02

score 89 · Answer 14 · 2018-04-09 21:07:34

89

Views

Does concatening $5^n$ and $31^n$ ever lead to a prime?

Published on 09 Apr 2018 - 21:07

score 433 · Answer 15 · 2026-03-25 04:24:08

433

Views

Show that the number of solutions to $x^n\equiv 1 \pmod p$ is $\gcd(n, p-1)$, where $p$ is a prime

Published on 25 Mar 2026 - 4:24

List Question

Is this quadratic form of any use to rule out ec-numbers to be prime?

How can I prove my answer about prime numbers is the only obvious answer?

Take p an odd prime and $a$ an integer with order $d$ mod p, is it true that if $d$ is even, then $a^{\frac{d}{2}} \equiv -1\pmod p$

Is $n^2 - n + 1$ prime infinitely often?

Is there a sequence producing almost all primes?

Number theory question involving Wilson's theorem. How to solve??

What about sequences $\{\sum_{k=1}^n (\operatorname{rad}(k))^p\}_{n\geq 1}$ containing an infinitude of prime numbers, where $p\geq 1$ is integer?

Is $n=13$ the only solution to this: $\pi\left(\sum_{i=1}^n\pi(i)\right)-1=n$.

asymptotic bound on number of primes from 1 to n

What is the set of all positive integers that can make a cuboid? Is there anything special about it?

sum of the primes with even indices and with odd indices

Closest lower-bound on the prime counting function

Which primes can never divide an "ec"-number?

Does concatening $5^n$ and $31^n$ ever lead to a prime?

Show that the number of solutions to $x^n\equiv 1 \pmod p$ is $\gcd(n, p-1)$, where $p$ is a prime

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