Mathematician:Maurice Kraitchik

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Belgian mathematician and writer who wrote on number theory and recreational mathematics.

Proved in $1922$ that the Mersenne number $M_{257}$ is composite, contrary to the claims of Marin Mersenne.




  • Born: April 21, 1882, Minsk, Russian Empire (now Belarus)
  • 1910: Graduated from the University of Liège
  • 1923: Graduated from the Université Libre de Bruxelles
  • 1931 - 1939: Editor of Sphinx
  • Between 1939 and 1945: Emigrated to the United States, started teaching at the New School for Social Research in New York City
  • Died: August 19, 1957, Brussels, Belgium



  • 1922: Théorie des Nombres
  • 1924: Recherches sur la Théorie des Nombres
  • 1930: La Mathématique des Jeux ou Récréations Mathématiques
  • 1944: Alignment Charts