Dumitrescu C., Popescu M., Seleacu V., Tilton H. The Smarandache Function in Number Theory

Aarhus: Erhus University Press, 1996. — 137 p.The function named in the title of this book is originated from the exiled Romanian mathematician Florentin Smarandache, who has significant contributions not only in mathematics, but also in literatuIe. He is the father of The Paradorut Literary Movement and is the author of many stories, novels, dramas, poems.
The Smarandache function, say S, is a numerical. function defined such that for every positive integer n, its image S(n) is the smallest positive integer whose factorial is divisible by n.