Shuangrui Tian

On Waring--Goldbach problem with mixed powers

It is proved that for every sufficiently large odd integer $n$, the equation $$ n=p_1^2+p_2^2+p_3^3+p_4^4+p_5^5+p_6^6+p_7^8 $$ is solvable in primes. This refines the work of Cai and Mu in 2015.