Triangular Number Pairs with Triangular Sum and Difference/Examples/T1869, T2090/Mistake
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Source Work
1986: David Wells: Curious and Interesting Numbers:
- The Dictionary
- $1,747,515$
1997: David Wells: Curious and Interesting Numbers (2nd ed.):
- The Dictionary
- $1,747,515$
Mistake
- Together with $2,185,095$ the $3$rd pair of triangular numbers whose sum and difference are also triangular.
This pair is very far from being the $3$rd such pair. In fact, ordered by the larger of the two elements, this is in fact the $26$th such pair.
Also see
- Triangular Number Pairs with Triangular Sum and Difference/Mistake, where the source of the error is explained.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1,747,515$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1,747,515$