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SHYAM SUNDER GUPTA is former Principal Chief Engineer, Indian Railways, Government of India. He is an Indian Railway Service of Engineers (IRSE) officer of batch 1981. He has experience of more than 35 years in various managerial, administrative and technical positions such as Principal Chief Engineer, Executive Director, Divisional Railway Manager, Director/RDSO on Indian Railways. A recreational mathematician, who is actively involved in popularising mathematics at the national and international levels, his major discoveries are equal product of reversible numbers (EPORNS), rare numbers, unique numbers, palindromic pseudo primes, fifth-order prime polynomial, 17350-digit memorable prime, etc. His interest in number recreations dates back to 1978, when his first paper “Miracles of last digit” was published. Since then his contributions have been published in Science Reporter, Science Today, Math Education, The American Mathematical Monthly, The Mathematical Gazette, Mathematical Spectrum, Scientia Magna, and several other international books like Unsolved problems in Number theory (by R.K. Guy), The Universal book of Mathematics (by David J. Darling), The Penguin Dictionary of Curious and Interesting Numbers (by David Wells), Prime Numbers: The Most Mysterious Figures in Math (by David Wells), Prime Curios!: The Dictionary of Prime Number Trivia (by Chris K. Caldwell and G.L. Honaker), and Those Fascinating Numbers (by Jean-Marie De Koninck). He is a co-author of the book, Civil Engineering through Objective Questions. 

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