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Luke_A_Somers comments on New Monthly Thread: Bragging - Less Wrong
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It is not clear to me why the above code works. In particular, the 10^80 part.
A number mod 10^n yields the last n digits of the number.
Aaah. it was just saying how much to output. Phew. I was trying to figure out what 10^80 could have to do with 3^^^3 and failing, hard. So, it's a great relief that the answer is, 'nothing'.
Technically, I have not used the fact that the number in question is 3^^^3 -- I am treating it as 3^^X, where X is very large. So for huge numbers of digits, this will not give the correct answer, but I don't think it's practical to compute that many digits, in any case.
Should I explain how everything else works?
Nah, I just figured that the named functions were something relevant, and I'm satisfied with that level of knowledge at this point.