I think there was a Supreme Court case about this, but it is one of my fun little thought experiments when it comes to expanding the House. Per Article I, Section 2:

The Number of Representatives shall not exceed one for every thirty Thousand, but each State shall have at Least one Representative

Under that math, California should have 1,320 Representatives. Wyoming would have 20 Representatives. Alas, as I mentioned above, I think there is a Supreme Court case that basically held that the 14th Amendment gives Congress the power to set the size of the House to an arbitrary number, like 435 - I just can’t find it at the moment.