Waring's prime number conjecture states that every odd integer is a prime or the sum of three primes. This problem is closely related to Vinogradov's theorem.
Waring's Prime Number Conjecture
See also
Goldbach Conjecture, Schnirelmann's Theorem, Vinogradov's TheoremExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Waring's Prime Number Conjecture." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/WaringsPrimeNumberConjecture.html