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Look at how it's written, rather then what is written.

Thanks, guys, I got it.

What is 28679718602997181072337614380936720482949 written in base 7?

I have converted this number from base 10 to base 7 with two different converters, and both gave me the same number. However, when I put the number in, it's wrong. Is there some trick to this one?