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(Added Quackery.)
(→‎{{header|Quackery}}: second method)
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1000 > until ]
echo</lang>
 
{{out}}
 
<pre>501</pre>
 
==={{header|Using algebra}}===
 
Noting that a²-b² ≡ (a+b)(a-b), and that in this instance b = a+1.
 
<lang Quackery> 1000 2 / 1+ echo</lang>
 
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