Goldbach’s conjecture

Working in Russia, German mathematician formulated a conjecture, still unproven: "Every even integer greater than 2 can be expressed as the sum of two primes."
 Christian Goldbach Russia 1742 Goldbach’s conjecture

Working in Russia, German mathematician formulated a conjecture, still unproven: "Every even integer greater than 2 can be expressed as the sum of two primes."