Number theory is one of branches of mathematics which deals with relations between Integer Numbers (positive and negative natural numbers and zero) which shown as Z numbers.

Number theory, as a course in undergraduate of mathematics, usually starts with topic of “Divisibility”. This section involves with some sub-topics like “division algorithm”, “Greatest Common Divisor”, “Least Common Multiple”, “Euclid Algorithm”, “Prime Numbers”, “Sieve of Eratosthenes”, “Fundamental Theorem of Arithmetic”, “Linear Diophantine Equations” and etc.

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