Goldbach's conjecture

Goldbach's conjecture
Letter from Goldbach to Euler dated 7 June 1742 (LatinGerman)
FieldNumber theory
Conjectured byChristian Goldbach
Conjectured in1742
Open problemYes
ConsequencesGoldbach's weak conjecture

Goldbach's conjecture is one of the oldest and best-known unsolved problems in number theory and all of mathematics. It states that every even natural number greater than 2 is the sum of two prime numbers.

The conjecture has been shown to hold for all natural numbers less than 4×1018, but remains unproven despite considerable effort.