perplexus.info :: Numbers : The number n in n^2

The number n in n^2 (Posted on 2019-04-11)

5 is in 5²=25, but 5 is at the end of 25. 10 is in 10²=100, but 100 ends in 0. What is the smallest positive integer n such that n is in n², and there is at least one nonzero digit after n in n²?

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in Basic

| Comment 2 of 3 |

For n = 1 To 1000000

n2 = n * n

ns$ = LTrim(Str(n))

n2s$ = LTrim(Str(n2))

ix = InStr(n2s, ns)

If ix > 1 And ix + Len(ns) <= Len(n2s) Then

good = 0

For i = ix + Len(ns) To Len(n2s)

If Mid(n2s, i, 1) > "0" Then good = 1: Exit For

If good Then Text1.Text = Text1.Text & n & Str(n2) & crlf: ct = ct + 1

End If

If ct >= 100 Then Exit For

DoEvents

Posted by Charlie on 2019-04-11 15:27:08

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