Triangular Number Calculator
Compute the nth triangular number T(n) = n(n+1)/2.
Input Data
N
Value
Results
The nth triangular number.
55
Explanatory note about the result.
T_10 = 10(10+1)/2 = 55
At a glance:T(n) = n(n+1)/2, the sum of the first n integers. Complements fibonacci and sequence.
Formula
T(n) = n(n+1)/2.
How to Use
- Enter n.
- The tool returns T(n).
Case Studies
n=10
55.
FAQ
Why triangular?
They form equilateral triangle dot patterns.
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References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.