Newbetuts

Is there a simple reason why the expected number of coin flips till getting $m$ more heads than tails or $n$ more tails than heads should be $mn$?

Rigid nonagons and rational solutions of a hyperelliptic equation

What is the maximum "alive density" of cells in Conway's Game of Life when played on a torus?

Mathematical Games suitable for undergraduates

Is it possible to shuffle a 3x3 Rubik's cube so that there's no more than 2 pieces of the same color in every face?

Primes made from alternating factorials

Request for a proof of the following continued-fraction identity

Secret santa problem

What is a nonlinear way the time on a clock can run?

Can somebody explain the plate trick to me?

Books with fun exercises

$3 \times 3 $ Magic Square of Squares

Tiling a cylindrical piece of paper

Proof of Closed Form Formula to convert a binary number to it's Gray code

sum of one hundred numbers

Conjugates and commutators for twisty puzzles -- so what?

Solving a scrambled $3 \times 3 \times 3$ Rubik's Cube with at most 20 moves!

New posts in recreational-mathematics

Possible all-Pentagon Polyhedra

Mental $n-$th root of $N$

Good Mathematical Puzzle Book for Couples

Is there a simple reason why the expected number of coin flips till getting $m$ more heads than tails or $n$ more tails than heads should be $mn$?

Rigid nonagons and rational solutions of a hyperelliptic equation

What is the maximum "alive density" of cells in Conway's Game of Life when played on a torus?

Mathematical Games suitable for undergraduates

Is it possible to shuffle a 3x3 Rubik's cube so that there's no more than 2 pieces of the same color in every face?

Primes made from alternating factorials

Request for a proof of the following continued-fraction identity

Secret santa problem

What is a nonlinear way the time on a clock can run?

Can somebody explain the plate trick to me?

Books with fun exercises

$3 \times 3 $ Magic Square of Squares

Tiling a cylindrical piece of paper

Proof of Closed Form Formula to convert a binary number to it's Gray code

sum of one hundred numbers

Conjugates and commutators for twisty puzzles -- so what?

Solving a scrambled $3 \times 3 \times 3$ Rubik's Cube with at most 20 moves!