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Perfect Square Digit (Posted on 2015-08-17) Difficulty: 3 of 5
The last two digits of a perfect square N, having at least 3 digits, is 09 (in this order).

Is the hundreds digit of N always even? Give reasons for your answer.

No Solution Yet Submitted by K Sengupta    
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Some Thoughts Can't find any under 10 billion | Comment 1 of 2
 For n100 = 1 To 99999999
   n = 100 * n100 + 9
   sr = Int(Sqr(n) + 0.5)
   If sr * sr = n And n100 Mod 2 = 1 Then
     Text1.Text = Text1.Text & n & crlf
     DoEvents
   End If
 Next

doesn't find any.

  Posted by Charlie on 2015-08-18 08:01:58
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