Meet Dattatreya Ramchandra Kaprekar: The Indian mathematician who discovered a ‘ghost number’ that always returns to itself

Apr 29, 2026 - 21:00
Meet Dattatreya Ramchandra Kaprekar: The Indian mathematician who discovered a ‘ghost number’ that always returns to itself

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A humble schoolteacher, Dattatreya Ramchandra Kaprekar, discovered the remarkable 6174 constant through simple number experimentation. This number, reached by a specific digit rearrangement process, became a 'ghost number' due to its fixed-point behavior. Initially overlooked, Kaprekar's work gained international acclaim, influencing math education and computer science with its elegant demonstration of iterative computation.

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