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I know using Euler's Totient function, it's easy to find the last $n$ digits of Graham's number (or any large repeating power tower), but is there any known way to find the first $n$ digits of Graham's Number? How about in binary? Or in any base besides a power of 3?

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Can anyone think of any other good tags for this problem? big-numbers was all I could find –  dspyz Apr 17 '13 at 21:55
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Finding the first $n$ digits is a completely different and much harder problem. Take a base-$10$ logarithm and you'll see that the problem boils down to computing the fractional part of the logarithm... –  Qiaochu Yuan Apr 17 '13 at 22:03
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Related: mathoverflow.net/questions/20765/… –  Lord Soth Apr 17 '13 at 22:10

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