It turns out that the common logarithms of each of the numbers from 2 through 9 can be very well approximated by rational numbers of the form n/40.
Derive each of the numerators with no calculation aids beyond pencil and paper.
(In reply to re: Who is right for 7?
Actually, 34/40 is closer to log(7) than 33/40.
Posted by Math Man
on 2011-06-01 19:01:51