Triangular number

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Triangular Number Sequence

1, 3, 6, 10, 15, 21, 28, 36, 45, ...

220px-First_six_triangular_numbers.svg.png

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Tn = n(n+1) / 2

Triangular number - Wikipedia - https://en.wikipedia.org/wiki/Triangular_number

Math is Fun - Triangular Number Sequence - https://www.mathsisfun.com/algebra/triangular-numbers.html

keywords

triangle triangular number sequence

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