Goldbach's conjecture
Even integers as sums of two primes
Goldbach's 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.
Read on Wikipedia · Image Christian Goldbach, Public domain
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