Exponential Math

We seem to be becoming more and more dependent on electronic databases.  When the power goes out, no one at a bank can calculate interest.

A hard copy backup of logarithms, both common and natural, does not need to include all numbers, only logs of prime numbers.  Theoretically, all non-prime numbers can be derived from logs of primes, by factoring the number wanted, then by adding the logs of the factors.

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