perplexus.info :: Just Math : Perfect Square Digit

Perfect Square Digit (Posted on 2015-08-17)

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.

See The Solution Submitted by K Sengupta

Rating: 5.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

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

doesn't find any.

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

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