Integer both Square and Triangular/Mistake
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Source Work
1986: David Wells: Curious and Interesting Numbers:
- The Dictionary
- $1225$
1997: David Wells: Curious and Interesting Numbers (2nd ed.):
- The Dictionary
- $1225$
Mistake
- It is the second number to be simultaneously square and triangular.
Correction
To be technically accurate, it is in fact the $3$rd, after $1$ and $36$.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $1225$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $1225$