Question

Finding a list of Cunningham chains online

score 325 · Answer 1 · 2018-03-28 15:12:04

325

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Finding a list of Cunningham chains online

Published on 28 Mar 2018 - 15:12

score 92 · Answer 2 · 2018-03-29 09:17:03

92

Views

Help understanding limits in Ramanujans proof of Bertrand's Postulate

Published on 29 Mar 2018 - 9:17

score 155 · Answer 3 · 2026-03-23 09:46:34

155

Views

Are the prime-free sequences $x_{n+1}=4x_n+1$ of odd numbers in bijection with the square numbers greater than $16$?

Published on 23 Mar 2026 - 9:46

score 1.4k · Answer 4 · 2018-03-29 14:42:50

1.4k

Views

How many integers up to 200 have exactly four factors?

Published on 29 Mar 2018 - 14:42

score 247 · Answer 5 · 2026-03-25 05:00:05

247

Views

How can I construct polynomials with "small" coefficients generating a prime "late"?

Published on 25 Mar 2026 - 5:00

score 502 · Answer 6 · 2026-03-25 09:22:21

502

Views

Modular Exponentiation using Euler's Theorem

Published on 25 Mar 2026 - 9:22

score 222 · Answer 7 · 2026-03-23 07:42:25

222

Views

On the least prime in an arithmetic progression $a + nb$ where $a,b$ are distinct primes.

Published on 23 Mar 2026 - 7:42

score 3.7k · Answer 8 · 2026-03-25 14:33:36

3.7k

Views

Prove that if a prime $p$ divides $a^2 + b^2$ then it must divide both a and b.

Published on 25 Mar 2026 - 14:33

score 182 · Answer 9 · 2026-03-22 19:49:40

182

Views

Show that $n+1$ is prime if (Denominator(Bernoulli Number($n$)))/($n+1$) is an integer

Published on 22 Mar 2026 - 19:49

score 302 · Answer 10 · 2026-03-25 19:43:53

302

Views

Primality criterion

Published on 25 Mar 2026 - 19:43

score 145 · Answer 11 · 2026-03-20 06:18:35

145

Views

Let $α=a+bi \in\mathbb{Z}[i]$ with $\gcd(a, b)=1$. Show that there exists $c\in\mathbb{Z}$ such that $c+i$ is a multiple of $α$ in $\mathbb{Z}[i]$.

Published on 20 Mar 2026 - 6:18

score 95 · Answer 12 · 2026-03-24 23:45:17

95

Views

Find all natural numbers $n$ for which $n = n'$

Published on 24 Mar 2026 - 23:45

score 247 · Answer 13 · 2018-03-31 18:03:23

247

Views

Trace of matrices with primes as elements

Published on 31 Mar 2018 - 18:03

score 92 · Answer 14 · 2026-03-25 03:07:34

92

Views

confusion on factoring a number into it's prime factors

Published on 25 Mar 2026 - 3:07

score 140 · Answer 15 · 2026-02-23 07:46:25

140

Views

Calculating probability of being $m$ and $(n-m)$ both prime in Goldbach conjecture

Published on 23 Feb 2026 - 7:46

List Question

Finding a list of Cunningham chains online

Help understanding limits in Ramanujans proof of Bertrand's Postulate

Are the prime-free sequences $x_{n+1}=4x_n+1$ of odd numbers in bijection with the square numbers greater than $16$?

How many integers up to 200 have exactly four factors?

How can I construct polynomials with "small" coefficients generating a prime "late"?

Modular Exponentiation using Euler's Theorem

On the least prime in an arithmetic progression $a + nb$ where $a,b$ are distinct primes.

Prove that if a prime $p$ divides $a^2 + b^2$ then it must divide both a and b.

Show that $n+1$ is prime if (Denominator(Bernoulli Number($n$)))/($n+1$) is an integer

Primality criterion

Let $α=a+bi \in\mathbb{Z}[i]$ with $\gcd(a, b)=1$. Show that there exists $c\in\mathbb{Z}$ such that $c+i$ is a multiple of $α$ in $\mathbb{Z}[i]$.

Find all natural numbers $n$ for which $n = n'$

Trace of matrices with primes as elements

confusion on factoring a number into it's prime factors

Calculating probability of being $m$ and $(n-m)$ both prime in Goldbach conjecture

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