Zip primes

This map shows a red dot for zipcodes in the US that are prime numbers. We have 0 zipcodes in the US. 0 of those are prime. So 0 percent of the zipcodes in the US are prime numbers.

The red dots are cities for which the zipcode is a prime number. Not very informative. Can we use an alternative way to render the map so the state size does not bias the visualization?

Here we render the same data but using a square cartogram.

Let's render the percentage of primes the state has out its total instead: