Factor Monster is our name for a classic game about natural numbers, factors, proper factors, prime numbers, composite numbers, and related algebraic alakazams. A computer version called Taxman appeared in People's Computer Company in 1972. It was also known as The Factor Game and described in the article "The Factor Game" by J.B. Harkin and D.S. Martin in the Arithmetic Teacher, volume 20, pages 580-582 (1973).

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