Numerical Domains of China (gkbrk.com)

Did you try running your script on the .cn and .com.cn TLDs? I'm sure you'd find more interesting results.

Certain numbers have certain meanings in China. Some are lucky, which are more occuring, and some are unlucky numbers, which you wont see much. This is the main reason for their use in domain names. More info here: https://en.wikipedia.org/wiki/Numbers_in_Chinese_culture