Question

Find the integers that double if the first and last digits are swapped

score 95 · Answer 1 · 2018-08-21 02:35:37

95

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Find the integers that double if the first and last digits are swapped

Published on 21 Aug 2018 - 2:35

score 165 · Answer 2 · 2018-08-24 10:25:47

165

Views

If $ x,y ∈\Bbb{Z} $ find $x$ and $y$ given: $2x^2-3xy-2y^2=7$

Published on 24 Aug 2018 - 10:25

score 1.4k · Answer 3 · 2026-03-22 23:20:55

1.4k

Views

Integer part of natural logarithm

Published on 22 Mar 2026 - 23:20

score 67 · Answer 4 · 2026-03-25 09:34:57

67

Views

Linear ordering $\leq$ on $\mathbb{Z}$ in ZFC

Published on 25 Mar 2026 - 9:34

score 78 · Answer 5 · 2026-03-26 06:28:24

78

Views

Number Theory: Divisibility on a set of consecutive integers

Published on 26 Mar 2026 - 6:28

score 161 · Answer 6 · 2026-03-26 06:29:57

161

Views

Number theory: Divisibility in block of any size

Published on 26 Mar 2026 - 6:29

score 192 · Answer 7 · 2018-08-30 10:20:47

192

Views

Numbers in Different Bases (reversed representation after conversions)

Published on 30 Aug 2018 - 10:20

score 231 · Answer 8 · 2018-08-31 01:11:49

231

Views

Solve $(x^2-5x+5)^{x^2-7x+12}= 1$.

Published on 31 Aug 2018 - 1:11

score 820 · Answer 9 · 2026-03-25 22:05:29

820

Views

Prove $\mathbb Z \gcd(a,b)=\mathbb Z a + \mathbb Z b$ without conclusion of Bézout's identity to define $\gcd$ similar to $\text{lcm}$

Published on 25 Mar 2026 - 22:05

score 297 · Answer 10 · 2026-03-25 20:35:18

297

Views

3 proofs: If an integer divides both $a$ and $b$, then it also divides $\text{gcd}(a,b)$.

Published on 25 Mar 2026 - 20:35

score 596 · Answer 11 · 2018-08-31 19:17:43

596

Views

Proving Anti-Symmetry of divides relation

Published on 31 Aug 2018 - 19:17

score 149 · Answer 12 · 2018-09-05 18:22:22

149

Views

If $f(x)$ is a polynomial and $f(n)$ is an integer for all $n\in \mathbb{Z}$, then $f(x)$ must have integer coefficients.

Published on 05 Sep 2018 - 18:22

score 355 · Answer 13 · 2018-09-07 04:20:25

355

Views

How can we prove that x^n - 1 always be a multiple of x - 1

Published on 07 Sep 2018 - 4:20

score 127 · Answer 14 · 2018-09-07 17:20:47

127

Views

Von Neumann integers definition

Published on 07 Sep 2018 - 17:20

score 73 · Answer 15 · 2018-09-08 07:21:48

73

Views

Positive integers satisfying: for all odd prime powers $p^k < n$, $n - p^k$ is prime

Published on 08 Sep 2018 - 7:21

List Question

Find the integers that double if the first and last digits are swapped

If $ x,y ∈\Bbb{Z} $ find $x$ and $y$ given: $2x^2-3xy-2y^2=7$

Integer part of natural logarithm

Linear ordering $\leq$ on $\mathbb{Z}$ in ZFC

Number Theory: Divisibility on a set of consecutive integers

Number theory: Divisibility in block of any size

Numbers in Different Bases (reversed representation after conversions)

Solve $(x^2-5x+5)^{x^2-7x+12}= 1$.

Prove $\mathbb Z \gcd(a,b)=\mathbb Z a + \mathbb Z b$ without conclusion of Bézout's identity to define $\gcd$ similar to $\text{lcm}$

3 proofs: If an integer divides both $a$ and $b$, then it also divides $\text{gcd}(a,b)$.

Proving Anti-Symmetry of divides relation

If $f(x)$ is a polynomial and $f(n)$ is an integer for all $n\in \mathbb{Z}$, then $f(x)$ must have integer coefficients.

How can we prove that x^n - 1 always be a multiple of x - 1

Von Neumann integers definition

Positive integers satisfying: for all odd prime powers $p^k < n$, $n - p^k$ is prime

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