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To mark the publication of issue 200, Tangente organized a problem-writing competition. Nine of the forty-three puzzles submitted received prizes, but many others deserved one too. We asked the jury members to single out their personal favorites.
After a busy career in public works engineering, during which he held various positions in Alsace, René Descombes (born in 1924!) has pursued his interest in magic squares since retiring.
From the biblical 666 to the Belphegor number, certain numbers send a shiver down the spine… and bring a smile to mathematicians' faces. Behind these "cursed" objects, the creativity and ingenuity of recreational mathematics run wild, ranging from number games to diabolical curiosities.
