Sum of Adjacent Sequences of Triangular Numbers/Historical Note
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Historical Note on Sum of Adjacent Sequences of Triangular Numbers
David Wells states in Curious and Interesting Numbers ($1986$) that this result was pointed out by M.N. Khatri, but fails to give details.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $15$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $15$