Question 1162885
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Two.


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ 9^2\ +\ 18\,\cdot\,9\ +\ 13\ = 256\ =\ 16^2]


*[tex \LARGE \ \ \ \ \ \ \ \ \ \ (-27)^2\ +\ 18\,\cdot\,(-27)\ +\ 13\ = 256\ =\ 16^2]


I looked at Jim's answer and so I went back and ran an Excel VBA routine to check from -100,000 to 100,000.  Didn't find any more in that range which really doesn't prove anything more than the -1000 to 1000 that Jim ran but does provide somewhat more of a warm fuzzy feeling that there are only 2.
								
								
John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it
<img src="http://c0rk.blogs.com/gr0undzer0/darwin-fish.jpg">
*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \  
								
{{n}\choose{r}}
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