15

Integrating $\int \frac{1}{1+e^x} dx$

math.stackexchange.com

15

Does theta(n)<n for all n imply the Riemann Hypothesis and/or vice versa?

mathoverflow.net

14

Score rock-paper-scissors

codegolf.stackexchange.com

14

Average digit sum in different bases

mathoverflow.net

14

What is known about $\sum_{n \leq x} \mu(n) \varphi(n)$?

mathoverflow.net

14

Compute the Carmichael function

codegolf.stackexchange.com

14

Are sums of the inverses of prime siblings finite?

mathoverflow.net

14

Two-Coloring Overlapping Circles

codegolf.stackexchange.com

14

Is my Diffy game degenerate?

codegolf.stackexchange.com

14

Gaussian prime spirals

mathoverflow.net

14

How do I show that the sum of the reciprocals of perfect cubes is less than 3/2?

math.stackexchange.com

14

Why can we just replace $z$ by $ z^2$ in this Taylor expansion?

math.stackexchange.com

14

What Is Bigger $100^{100}$or $\sqrt{99^{99} \cdot 101^{101}}$

math.stackexchange.com

14

Any odd number is of form $a+b$ where $a^2+b^2$ is prime

math.stackexchange.com

14

Why is $f(x) = x\phi(x)$ injective, i.e. $x\phi(x) = y\phi(y)\Rightarrow x = y$

math.stackexchange.com

14

Made a joke in poor taste without thinking in front of students. Is there anything I can do to salvage myself?

academia.stackexchange.com

14

Are there two contradictory definitions of the limit of a function at a point?

math.stackexchange.com

13

Small primes in arithmetic sequences

mathoverflow.net

13

A question on the number of subgroups of a given exponent of a finite abelian p-group

mathoverflow.net

13

Why isn't the derivative of the volume of the cone its surface area?

math.stackexchange.com

13

Derivative of irrational function is undefined at zero, but it seems weird for me.

math.stackexchange.com

13

L'Hopital's Rule not working on $\lim_{x \to \infty}\frac{-3x+2}{x+\sin x}$

math.stackexchange.com

13

Do the Liouville Numbers form a field?

math.stackexchange.com

13

The line between axiom and theorem

math.stackexchange.com

13

Evaluating the sum $\sum_{n=1}^{\infty} \frac{e - \left(1 + \frac{1}{n}\right)^n}{\sqrt{n}}$

math.stackexchange.com

13

On the existence of a particular type of finite measure on $\mathbb N$

mathoverflow.net

13

Naturally occuring counting process with a 1/log asymptotics?

mathoverflow.net

13

How does it look if I finish my PhD in five years instead of four?

academia.stackexchange.com

13

Is it within the Cantor set?

codegolf.stackexchange.com

13

Turn me 22.5 with a rose

codegolf.stackexchange.com