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Unit
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14 votes
2 answers
363 views

$x^5 + y^2 = z^3$

13 votes
1 answer
288 views

Failure of existence of GCD

13 votes
4 answers
3k views

Rolling a die until two rolls sum to seven

11 votes
2 answers
281 views

Asymptotic behaviour of $f(x) = \sum_{n=1}^\infty n^\varepsilon \frac{x^n}{n!}$ for $\varepsilon\in(0,1)$

8 votes
3 answers
277 views

Closed form for $\prod_{n=0}^\infty (1-z^{2^n})$

8 votes
2 answers
206 views

Squarefree totient sum

7 votes
0 answers
378 views

Infinite Burnside lemma

7 votes
1 answer
807 views

Generating all coprime pairs

6 votes
1 answer
143 views

Abelian group zeta function

6 votes
1 answer
73 views

Diagonalizability via forms

6 votes
3 answers
505 views

Sum of reciprocal binomial coefficients

5 votes
2 answers
369 views

Power series of $\log(1+x)\log(1-x)$

5 votes
1 answer
175 views

Optimal strategy for selling turnips

4 votes
1 answer
172 views

Two meanings of "residue field"

4 votes
0 answers
330 views

Automorphisms of $\mathbb{A}^1_R$

4 votes
1 answer
178 views

Confused by a proof about harmonic numbers

4 votes
2 answers
86 views

If an eventual inequality holds for $f$ and $g \sim f$ then does it hold for $g$?

4 votes
2 answers
296 views

Growth of $\pi(2x) - 2\pi(x)$

4 votes
1 answer
153 views

Asymptotic growth of a convolution (counting n-bead 2-colour necklaces)

3 votes
1 answer
250 views

Limit at infinity of a function series

3 votes
1 answer
188 views

Can we define Möbius functions on preordered sets?

3 votes
1 answer
52 views

Uniquely factoring a group element

3 votes
1 answer
128 views

What are the groups $\text{Hom}(F^\times\!, F^+\!)$ and $\text{Hom}(F^+\!, F^\times\!)$?

3 votes
2 answers
421 views

Other ways to compute this integral?

3 votes
0 answers
301 views

Coincident hypotenuses in the spiral of Theodorus

3 votes
2 answers
80 views

Slow variation of counting functions

2 votes
1 answer
59 views

Nonconjugate subgroups each containing a conjugate of the other

2 votes
1 answer
127 views

Fermat's Little Theorem and Hilbert's Nullstellensatz

2 votes
1 answer
421 views

On the terms "nowhere dense" and "dense-in-itself"

1 vote
1 answer
96 views

Multiplication in local rings