n = 8
For i = 1 To 7
n = (n - 2) * 10 + 8
Text1.Text = Text1.Text & n & " " & n * n & crlf
Next
finds
68 4624
668 446224
6668 44462224
66668 4444622224
666668 444446222224
6666668 44444462222224
66666668 4.44444462222222E+15
The numbers on the left are of the form provided, and their squares appear on the right.
When there are n 6's, the square has
n 4's
one 6
n 2's
one 4
The sum of digits is 6*n+10.
We are given n = 10^5 - 1, so the s.o.d. of the square is 6*10^5 + 4 = 600004.
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Posted by Charlie
on 2019-05-17 19:25:55 |
solution
