Generalize logarithmic coincidences After playing around with logarithms, I've found the following coincidences: log_(10)2~~0.3, since 2^(10)~~10^3, and log_(10)5~~0.7, since 5^(1000)~~10^(700). I'm sure these are well known. I was just wondering if there was a method or algorithm to generalize these "coincidences" to any base or number. I only have a basic understanding of number theory and would like to learn more.

Haley Madden

Haley Madden

Answered question

2022-07-16

Generalize logarithmic coincidences
After playing around with logarithms, I've found the following coincidences:
log 10 2 0.3, since 2 10 10 3 , and log 10 5 0.7, since 5 1000 10 700
I'm sure these are well known. I was just wondering if there was a method or algorithm to generalize these "coincidences" to any base or number. I only have a basic understanding of number theory and would like to learn more.

Answer & Explanation

Monica Dennis

Monica Dennis

Beginner2022-07-17Added 13 answers

For example: for 2 b 3 d , then b d ln ( 3 ) ln ( 2 ) . So we can find a rational approximant (using continued fractions?) for ln ( 3 ) ln ( 2 ) , say
268167867796283 169195086744492
and
2 268167867796283 3 169195086744492
and
log 2 ( 3 ) 268167867796283 169195086744492

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