Greek Philosophy
Triangular numbers are a sequence of numbers that can form an equilateral triangle when represented as dots. The nth triangular number is the sum of the first n natural numbers, which can be expressed mathematically as $$T_n = \frac{n(n + 1)}{2}$$. These numbers illustrate the Pythagorean view of numbers as both geometric and arithmetic, representing a fundamental relationship between geometry and number theory.
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