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1984 AMC 12/AHSME
9
Number of digits
Number of digits
Source:
October 15, 2005
logarithms
floor function
number theory
prime factorization
Problem Statement
The number of digits in
4
16
5
25
4^{16} 5^{25}
4
16
5
25
(when written in the usual base 10 form) is A. 31 B. 30 C. 29 D. 28 E. 27
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