Four prime squares and powers of 2
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Hongze Li (2006)
Acta Arithmetica
Jianya Liu, Guangshi Lü (2004)
Acta Arithmetica
Lilu Zhao (2014)
Acta Arithmetica
By developing the method of Wooley on the quadratic Waring-Goldbach problem, we prove that all sufficiently large even integers can be expressed as a sum of four squares of primes and 46 powers of 2.
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