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Recreational mathematicians
Recreational cryptographers
Henry Dudeney
Ian Stewart (mathematician)
W. W. Rouse Ball
Alexander Dewdney
Harold Scott MacDonald Coxeter
Édouard Lucas
Raymond Smullyan
Piet Hein
Martin Gardner
Douglas Hofstadter
Neil J. Calkin
Laura Taalman
Ivan Moscovich
Alexander Bogomolny
Burkard Polster
Chaim Goodman-Strauss
David A. Klarner
Colm Mulcahy
Patrick Michael Grundy
Jean-Paul Delahaye
Joseph Madachy
Wilhelm Ahrens (mathematician)
Thomas von Randow
Lee Sallows
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