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When expressed in base 8, $N!$ terminates in a block of exactly 21 zeros. Find the largest positive integer $N$ with this property. (Enter $N$ as a decimal number.)

I found that 65! has a factorization that includes 2^63=8^21, but I was told that was wrong. 

 May 3, 2020
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See here - https://web2.0calc.com/questions/please-help_52210

 

coolsmileycool

 May 3, 2020

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