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His work on the twin prime conjecture and on Goldbach's conjecture led to progress in analytic number theory. In a 1966 paper he proved what is now called Chen's theorem: every sufficiently large even number can be written as the sum of either two primes, or a prime and a semiprimeIn mathematics, a semiprime (also called biprime or 2- almost prime is a natural number that is the product of two (not necessarily distinct) prime numbers. The first few semiprimes are 4, 6, 9, 10, 14, 15, 21, 22, 25, 26,. sequence in OEIS). External lin (the product of two primes)—e.g., 100 = 23 + 7·11.