Mathematician:Nobuyuki Yoshigahara

Mathematician
Japanese inventor, collector, solver, and communicator of puzzles.

Nationality
Japanese

History

 * Born: May 27, 1936 in Japan
 * Died: June 19, 2004 in Japan

Theorems and Definitions

 * Discoverer of $6 \, 661 \, 661 \, 161$, the largest known square with only $2$ distinct digits

Also known as
In Japanese, his name is rendered 芦ヶ原 伸之.

Popularly known by his diminutive Nob.