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PEN S Problems
2
2
Part of
PEN S Problems
Problems
(1)
S 2
Source:
5/25/2007
It is given that
2
333
2^{333}
2
333
is a
101
101
101
-digit number whose first digit is
1
1
1
. How many of the numbers
2
k
2^k
2
k
,
1
≤
k
≤
332
1 \le k \le 332
1
≤
k
≤
332
, have first digit
4
4
4
?
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