A Game Theory Puzzle

Are there primes of every possible number of digits?

Prove that if $p$ is a prime, $a$ is an integer, and $p$ divides $a^2$, then $p$ divides $a$.

Identify $ \sum\limits_{k=-\infty}^{\infty} \frac{1}{(x+k)^2}$

Local vs global truncation error

Prove $\int_0^{\pi/2}x^2\sqrt{\cot x} \ dx=\frac{\sqrt2}{8}\left( \frac{5\pi^{3}}{12}-\pi^2\ln2-\pi \ln^22 \right)$

Understanding power series and their representation of functions

Prove: $\cos^3{A} + \cos^3{(120°+A)} + \cos^3{(240°+A)}=\frac {3}{4} \cos{3A}$

How do you prove Cov $\left( \bar{X} , X_i - \bar{X} \right) = 0$?

Difference between $((a+b)/2)^2$ and $ab$?

Axiomatic approach to the definition of variance

Why Two's Complement works

Finite groups as subgroups of dihedral groups

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