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Dudeney number : ウィキペディア英語版 | Dudeney number A Dudeney number is a positive integer that is a perfect cube such that the sum of its decimal digits is equal to the cube root of the number. There are exactly six such integers : The name derives from Henry Dudeney, who noted the existence of these numbers in one of his puzzles, ''Root Extraction'', where a professor in retirement at Colney Hatch postulates this as a general method for root extraction. == References ==
*H. E. Dudeney, ''536 Puzzles & Curious Problems'', Souvenir Press, London, 1968, p 36, #120.
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