Elementary number theory is the branch of number theory in which elementary methods (i.e., arithmetic, geometry, and high school algebra) are used to solve equations with integer or rational solutions. An example of a problem which can be solved using elementary number theory is the classification of all Pythagorean triples.
Elementary Number Theory
See also
Diophantine Equation, Elementary Methods, Elementary Proof, Number TheoryThis entry contributed by David Terr
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Terr, David. "Elementary Number Theory." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/ElementaryNumberTheory.html