Place the numbers 1 to 13 in the following boxes so that the sums of the numbers on each straight line (even on the outside) are equal.
Dive into the world of Euler’s phi-function and reveal its hidden connection to prime factors
Can you use logical thinking to figure out what’s inside them?
At what angles do the connecting lines of the edges of a regular tetrahedron intersect?
A nice proof problem with a possible interpretation in four-dimensional space.
Show that 15𝑥² − 7𝑦² = 9 has no integer solution.
Show that five lattice points can always be connected in a specific way.
