Sums of Three Prime Squares
Hiroshi Mikawa, Temenoujka Peneva (2007)
Bollettino dell'Unione Matematica Italiana
Similarity:
Let be arbitrary. Suppose that is a sufficiently large positive number. We prove that the number of integers , satisfying some natural congruence conditions, which cannot be written as the sum of three squares of primes is , provided that .