Questions tagged [recreational-mathematics]

Puzzles, curiosities, brain teasers and other mathematics done "just for fun".

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20
votes
2answers
554 views
+400

Graceful graphs with Valence $k$

For a graceful graph ( code ), vertices are labeled with values from 0 to $e$ so that the $e$ edge differences are all values from 1 to $e$. The below is now OEIS sequence A308722. $K_3$ is the ...
4
votes
1answer
134 views
+50

A magician places $n$ coins on a table and walks down off the stage.

A magician places n coins on a table and walks down off the stage. A volunteer comes, turns over whichever coins he wishes, selects one coin and whispers its number to the apprentice. Then the ...