Eratosthenes.

(about 276-194 B.C.)

     Eratosthenes - ancient scientist was born in Cirene. He got his education in Alexandria and Athens, managed the library at Alexandria - the first library in the history of the mankind. He worked in many areas of ancient science: studied astronomy, philology, philosophymusic laid a foundation of mathematical geography. In the field of mathematics, side by, side with many valuable achievements, Eratosthenes gave the well-known method of finding of prime numbers using so-colled Eratosthenes sieve.