Triple of Triangular Numbers whose Pairwise Sums are Triangular/Historical Note
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Historical Note on Triple of Triangular Numbers whose Pairwise Sums are Triangular
The result Triple of Triangular Numbers whose Pairwise Sums are Triangular was reported in Richard K. Guy's Unsolved Problems in Number Theory, 2nd ed. of $1994$ as having been provided by Charles Ashbacher.
Sources
- 1994: Richard K. Guy: Unsolved Problems in Number Theory (2nd ed.)
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $66$