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Coscott comments on Open thread, August 26 - September 1, 2013 - Less Wrong Discussion
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If you are going to memorize any logs, you should only bother memorizing logs of primes, since you can add those together to get other numbers.
This took me a minute. Just to unpack for the dense ones like me:
log(a * b) = log(a) + log(b)
so if you memorize log(7) and log (11), log(77) is easy as pi.