What is it?

a billboard appeared next to the Highway 101 in California

I think a lot of people don't understand the meaning of this billbord. Even you get it, it's also not so easy to write a program to find that number to add to the url to point to that website. What the heck is that?

If we browse the value of number 'e' (2.71828 18284 59045 23536 02874 7135...), we found that the first 10-digit prime number within these decimals is '7427466391'. So this ad is by '7427466391.com', which contains more clues.

I think a lot of you may realise that this is recuitment site for some software company that trying to get attention to new talents. This website '7427466391.com' which is now already closed is hosted on Google server. On that website is another puzzle to solve and if you can get thruogh that it will bring you to Google web page and an invitation to work with Google!.. WOW.

This is indeed a really cool campaign to recruite pepole to work with. Instead of advertising in the newspaper and go through piles of resume and many interviews. The ads can screen the people who has a strong mathematical and programming backlground and really wanna go through this.