Jefferson method

Jefferson's method was used to apportion the U.S. House of Representatives between 1792 and 1840.

Procedure
Choose a divisor D. A state with population N (or a political party with N seats) is entitled to floor(N/D) seats. If the number of seats allocated equals the size of the legislative body, then use the apportionment just calculated. Otherwise, choose a new value for D and try again.

Example
If a divisor of 55 000 is used, the resulting apportionment is