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25
“How long 'til we get there?” Road trip puzzle
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20
Convergence/Divergence of infinite series $\sum_{n=1}^{\infty} \frac{(\sin(n)+2)^n}{n3^n}$
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16
Showing that $\sqrt \pi$ is transcendental
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14
Is a group with only finitely many subgroups of index n (for all n) finitely generated
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13
Predicting Real Numbers
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12
Uncountability of countable ordinals
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11
If $E/\mathbf Q$ is an elliptic curve and $n$ is odd, then the $n$-torsion $E(\mathbf Q)[n]$ is cyclic; elementary proof?
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11
Proving identities like $\sum_{k=1}^nk{n\choose k}^2=n{2n-1\choose n}$ combinatorially
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11
Does there exist $a,b,c\in \mathbb Q$ such that $(a+b+c)^2 + 3(a+b+c)+5=2(ab+bc+ca)$
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10
Another quadratic Diophantine equation: How do I proceed?
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10
Find The Last 3 digits of the number $2003^{2002^{2001}}$
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10
3rd iterate of a continuous function equals identity function
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10
Is there a $k$ such that $a_n=\frac{n^k!}{(n^k!!)^2}$ converges?
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8
Find all integer solutions to $\displaystyle{2^k = 9^m+7^n}$
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8
$(\mathbb{Q},+)$ has no maximal subgroup
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8
Sequence involving primes of form $n^2 + n+1$
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8
Why $x^{(1/2)2} \neq x^{2(1/2)} $?
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8
Could we show $1-(x-\dfrac{x^3}{3!}+\dfrac{x^5}{5!}-\dots)^2=(1-\dfrac{x^2}{2!}+\dfrac{x^4}{4!}- \dots)^2$ if we didn't know about Taylor Expansion?
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8
Solve: $x^2-py^2=q$
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7
Completing $\Bbb R$ when some “divergent” sequences are Cauchy sequences
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7
prove that the field extension is cyclic
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7
Does the series $ \sum\limits_{n=1}^{\infty} \frac{1}{n^{1 + |\sin(n)|}} $ converge or diverge?
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7
Quadratic Diophantine Equations
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7
Is this a new expression for $e$?
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7
How can I find the value of $a^n+b^n$, given the value of $a+b$, $ab$, and $n$?
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7
Inequality in a bounded real sequence
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6
Find all integers $n\in\mathbb{N}^*$ such that any integer $k$ satisfying $1\le k\le \sqrt{n}$ divides $n$
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6
Subset of $\mathbb{Q}$
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6
Direct limit of $\mathbb{Z}$ homomorpisms
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6
How to find a explicit field morphism
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