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Recreational mathematicians
Recreational cryptographers
Lewis Carroll
D. R. Kaprekar
Daniel Tammet
Matt Parker
Roger Penrose
Vi Hart
Ed Pegg, Jr.
Júlio César de Mello e Souza
Solomon W. Golomb
Kathleen Ollerenshaw
Ernő Rubik
Clifford A Pickover
Raymond Smullyan
Bram Cohen
Susan Goldstine
María Antònia Canals
Jessica Sklar
Laurie Brokenshire
J. A. Lindon
Wilhelm Ahrens (mathematician)
Thomas von Randow
David Eppstein
Walter Trump
Scott Kim
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