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Recreational mathematicians
Recreational cryptographers
Lewis Carroll
D. R. Kaprekar
Daniel Tammet
Matt Parker
Roger Penrose
Ed Pegg, Jr.
Solomon W. Golomb
Kathleen Ollerenshaw
Ernő Rubik
Clifford A Pickover
Bram Cohen
Susan Goldstine
María Antònia Canals
Jessica Sklar
Vi Hart
Laurie Brokenshire
J. A. Lindon
David Eppstein
Walter Trump
Júlio César de Mello e Souza
Scott Kim
Yakov Perelman
David Singmaster
Erik Demaine
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