Mathematics GCSE
Triangular numbers
What Triangular numbers means in Mathematics GCSE, as defined for AQA.
Definition of Triangular numbers
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Reference: AQA
A sequence such as 1, 3, 6, 10, 15, ... where each term is the sum of the first n natural numbers, and the nth is n(n + 1)/2.
Topics that use Triangular numbers
- Sequences (AQA GCSE)
Related terms
- Arithmetic progressions
- Coefficient
- coefficient of n²
- Common ratio
- constant second difference
- Fibonacci-type sequence
- First difference
- generate terms
Using Triangular numbers in the exam
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