Question

Can every odd number be represented as $2pq-r$ where $p$,$q$, and $r$ are distinct odd primes?

score 98 · Answer 1 · 2026-04-15 01:25:45

98

Views

Can every odd number be represented as $2pq-r$ where $p$,$q$, and $r$ are distinct odd primes?

Published on 15 Apr 2026 - 1:25

score 266 · Answer 2 · 2026-04-15 20:03:49

266

Views

Prove that there is no non-constant polynomial $P(x)$ such that $P(n)$ is a prime number for all positive integers n

Published on 15 Apr 2026 - 20:03

score 107 · Answer 3 · 2026-04-09 11:22:44

107

Views

Can it be shown that numbers of a certain form produce primes more often than expected?

Published on 09 Apr 2026 - 11:22

score 363 · Answer 4 · 2026-04-17 10:12:47

363

Views

Primes $p$ and $q$ such that $3p^{q-1}+1$ divides $11^p+17^p$

Published on 17 Apr 2026 - 10:12

score 403 · Answer 5 · 2026-04-17 02:08:02

403

Views

Two numbers divisible by the same prime. If concatenated still divisible by the same prime number?

Published on 17 Apr 2026 - 2:08

score 25 · Answer 6 · 2026-04-12 02:54:15

25

Views

Are there infinitely many Substrimes in any base?

Published on 12 Apr 2026 - 2:54

score 134 · Answer 7 · 2026-04-11 18:15:37

134

Views

Limit of a formula to find the closest number to a prime less than an even number in given range

Published on 11 Apr 2026 - 18:15

score 207 · Answer 8 · 2026-04-15 21:37:26

207

Views

Show that Goldbach’s Conjecture is true if and only if $N \not\vdash \neg Goldbach$.

Published on 15 Apr 2026 - 21:37

score 96 · Answer 9 · 2026-04-12 21:16:50

96

Views

Infinite prime cylinders?

Published on 12 Apr 2026 - 21:16

score 50 · Answer 10 · 2026-04-11 02:54:08

50

Views

Simple recurrence relation to yield nearby prime

Published on 11 Apr 2026 - 2:54

score 342 · Answer 11 · 2026-04-14 18:55:21

342

Views

Prime divisors of $n^2-5$

Published on 14 Apr 2026 - 18:55

score 96 · Answer 12 · 2026-04-17 07:36:24

96

Views

$p$ prime number, $p = a\cdot b$, then $a=1$ or $b=1$

Published on 17 Apr 2026 - 7:36

score 39 · Answer 13 · 2026-04-13 04:22:23

39

Views

Question from number theory related to GCD

Published on 13 Apr 2026 - 4:22

score 73 · Answer 14 · 2026-04-17 12:35:32

73

Views

Group of order $2^2 \cdot 3^n$, $n \geq 1$.

Published on 17 Apr 2026 - 12:35

score 31 · Answer 15 · 2026-03-26 17:53:24

31

Views

If a case of the Bunyakovsky conjecture holds for degree-$n$ $p(x)$, does it hold for all degree-$n$ $f(x)$ satisfying the criterion?

Published on 26 Mar 2026 - 17:53

List Question

Can every odd number be represented as $2pq-r$ where $p$,$q$, and $r$ are distinct odd primes?

Prove that there is no non-constant polynomial $P(x)$ such that $P(n)$ is a prime number for all positive integers n

Can it be shown that numbers of a certain form produce primes more often than expected?

Primes $p$ and $q$ such that $3p^{q-1}+1$ divides $11^p+17^p$

Two numbers divisible by the same prime. If concatenated still divisible by the same prime number?

Are there infinitely many Substrimes in any base?

Limit of a formula to find the closest number to a prime less than an even number in given range

Show that Goldbach’s Conjecture is true if and only if $N \not\vdash \neg Goldbach$.

Infinite prime cylinders?

Simple recurrence relation to yield nearby prime

Prime divisors of $n^2-5$

$p$ prime number, $p = a\cdot b$, then $a=1$ or $b=1$

Question from number theory related to GCD

Group of order $2^2 \cdot 3^n$, $n \geq 1$.

If a case of the Bunyakovsky conjecture holds for degree-$n$ $p(x)$, does it hold for all degree-$n$ $f(x)$ satisfying the criterion?

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