Definition:Triangular Number/Historical Note
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Historical Note on Triangular Number
The triangular numbers were named thus by the ancient Greeks, who formed them by adding up the series:
- $1 + 2 + 3 + 4 + 5 + \cdots$
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $15$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $15$