I'm trying to find
Triangular numbers that are also square. So $m^2=\frac{n(n+1)}{2}$
I don't want the actual answer with the solution but I'd like to
solve the problem myself : I need some clues to take me on the right track.
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Matthew Conroy
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Andrea
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Are you familiar with Pell's equation and methods of solving equations of that form? https://en.wikipedia.org/wiki/Pell's_equation – Matthew Conroy Mar 30 '17 at 19:02
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No. But now I can learn Pell's equation. – Andrea Mar 30 '17 at 19:05
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You're welcome! – Matthew Conroy Mar 30 '17 at 19:06
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This question also offers a great triangular-square insight. – Dietrich Burde Mar 30 '17 at 19:14