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D. R. Kaprekar

Indian mathematician
Dattatreya Ramchandra Kaprekar was an Indian recreational mathematician who described several classes of natural numbers including the Kaprekar, harshad and self numbers and discovered the Kaprekar's constant, named after him. Wikipedia
Born: January 17, 1905, Dahanu, India
Died: 1986 (age 81 years), Deolali Pravara, India
Education: Fergusson College (1923–1929)
Known for: Contributions to recreational mathematics