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Hardy, G.H. and Wright, E.M. (2008) An Introduction to the Theory of Numbers. Oxford University Press.
https://doi.org/10.1093/oso/9780199219858.001.0001

has been cited by the following article:

• TITLE: A Sufficient Condition for the Primality of the Sum of Two Squares

  AUTHORS: Han-Lin Li, Shu-Cherng Fang, Way Kuo

  KEYWORDS: Fermat, Brahmagupta-Fibonacci Identity, Primality

  JOURNAL NAME: Advances in Pure Mathematics, Vol.16 No.6, June 11, 2026

  ABSTRACT: The famous Fermat’s Christmas Theorem states that all Pythagorean primes can be expressed as a sum of two squares of integers. This report specifies the conditions that a ( 4k+1 )-type integer expressed in a sum of two squares becomes prime.