Sum of Sequence of Triangular Numbers/Historical Note
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Historical Note on Sum of Sequence of Triangular Numbers
David M. Burton, in his Elementary Number Theory, revised ed. of $1980$, reports that this result is attributed to Aryabhata the Elder and dates from circa $500$ C.E.
Sources
- 1980: David M. Burton: Elementary Number Theory (revised ed.) ... (previous) ... (next): Chapter $1$: Some Preliminary Considerations: $1.3$ Early Number Theory: Problems $1.3$: $3$