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User:Philippe Esperet
From OeisWiki
Retired mathematical, computer science teacher at lycée Henri IV (Paris -- France)
http://www.yann-ollivier.org/betisiers/bes/bes
http://culturemath.ens.fr/content/le-berlekamps-switching-game
www.trigofacile.com/maths/curiosite/primarite/.../presentation.htm