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New posts in recreational-mathematics
Longest path in a square grid
graph-theory
recreational-mathematics
What is the flaw in this proof that all triangles are isosceles?
geometry
recreational-mathematics
triangles
fake-proofs
Is $11^2+12^2+13^2+14^2+15^2+16^2=1111$ special?
elementary-number-theory
recreational-mathematics
Why should Rubik's cube get attention from mathematicians?
soft-question
recreational-mathematics
puzzle
rubiks-cube
Is high school contest math useful after high school?
recreational-mathematics
education
contest-math
Get $5$ by doing any operations with four $7$s
arithmetic
recreational-mathematics
puzzle
What is the smallest polyomino that can't surround a $1\times 1$ hole?
recreational-mathematics
polyomino
Is the Collatz conjecture in $\Sigma_1 / \Pi_1$?
logic
recreational-mathematics
computability
Ways of choosing $16$ integers from first $150$ integers such that there is no $(a,b,c,d)$ for which $a+b=c+d$
sequences-and-series
combinatorics
contest-math
recreational-mathematics
Which week day(s) cannot be the first day of a century?
contest-math
recreational-mathematics
puzzle
The next number that has this property?
elementary-number-theory
recreational-mathematics
Given an $n\times n\times n$ cube, what is the largest number of $1\times 1\times 1$ blocks that a plane can cut through?
combinatorics
geometry
recreational-mathematics
combinatorial-geometry
Minimal generating set of Rubik's Cube group
group-theory
permutations
recreational-mathematics
rubiks-cube
What is the simplest ellipse that goes through exactly 13 lattice points?
number-theory
polynomials
diophantine-equations
recreational-mathematics
conic-sections
Probability of $5$ fair coin flips having strictly more heads than $4$ fair coin flips
probability
recreational-mathematics
Shortest distance around a pyramid
geometry
recreational-mathematics
How can I find integers which satisfy $\frac{150+n}{15+n}=m$?
algebra-precalculus
divisibility
recreational-mathematics
integers
Special properties of the number $146$
elementary-number-theory
soft-question
recreational-mathematics
integers
Non-self-intersecting "Robot Walks"
combinatorics
recreational-mathematics
discrete-geometry
Infinite prisoners with hats -- is choice really needed?
set-theory
recreational-mathematics
axiom-of-choice
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