## Representation of even integers as a sum of squares of primes and powers of two

### Volume 206 / 2022

Acta Arithmetica 206 (2022), 353-372
MSC: Primary 11P32; Secondary 11P55, 11P05.
DOI: 10.4064/aa220306-11-11
Published online: 21 December 2022

#### Abstract

In 1951, Linnik proved the existence of a constant $K$ such that every sufficiently large even number is the sum of two primes and at most $K$ powers of 2. Since then, this style of approximation has been considered for problems similar to the Goldbach conjecture. One such problem is the representation of a sufficiently large even number as the sum of four squares of primes and at most $k$ powers of 2. In 2014, Zhao proved this to be true with $k = 46$. In this paper, we reduce this to $k = 31$.