A number theory problem by Hemanth K

Find the number of integers n n such that log 2 n \log_2 n and log 3 n \log_3 n are both integers as well.

2 There are infinitely many 0 3 1

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2 solutions

Chew-Seong Cheong
Aug 28, 2016

For log 2 n \log_2 n to be an integer, n n must be a power of 2. Similarly, For log 3 n \log_3 n to be an integer, n n must be a power of 3. The only power possible is 0, that is 2 0 = 3 0 = 1 2^0 = 3^0 = 1 and log 2 1 = log 3 1 = 0 \log_2 1 = \log_3 1 = 0 , therefore, there is only 1 \boxed{1} integer n n satisfies the conditions.

Hemanth K
Aug 27, 2016

means 2^x=3^y; it is only one solution that is x=0,y=0 means n=1; 2^x is even and 3^y is odd so they both are not equal so no other answer

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