Introduction.

Some definitions.

GOLDBACH, Christian, Prussian (German) mathematician (Königsberg 18.03.1690 - Moskou 20 (30).11.1764). After him is been named the conjecture that each even number which is at least 4, can be written as the result of an addition of two prime numbers. Untill these days, this conjecture has not been rejected nor it has been proved.

A PRIME NUMBER, is a natural number (bigger than 1) that has exactly two (distinct) natural number divisors, being 1 and itself.