Goldbach's conjecture

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The even integers from 4 to 28 as sums of two primes: Even integers correspond to horizontal lines. For each prime, there are two oblique lines, one red and one blue. The sums of two primes are the intersections of one red and one blue line, marked by a circle. Thus the circles on a given horizontal line give all partitions of the corresponding even integer into the sum of two primes.

Proper noun[edit]

Goldbach's conjecture

  1. (number theory) A conjecture stating that every even integer greater than 2 can be expressed as the sum of two primes, which has been shown to hold up through 4 × 1018,[1] but remains unproven.

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