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first 10-digit prime found in consecutive digits of e

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Recently riding my motorcycle on highway 101, south of San Francisco I've noticed big advertisement poster:

first 10-digit prime found in consecutive digits of e

(I stole the picture from some later post in spanish who also found the number. When I worked on this, google search did not find any results for this puzzle).

Out of curiosity I decided to find out what it is. Since I am still learning Haskell, I decided that that would be nice Haskell exercise. It was nice exercise indeed, in course of which I have learned more about Haskell and things like Rabin-Miller Probable Prime Test and Spigot Algorithm

Well, I did it and was able to find number. I went to the site, expecting something exiting, but it just says "Congratulations. You've made it to level 2" and offers next puzzle. Frankly, without knowing what it is about (I guess this is a new way to screen employees) I am not very inclined to spend more time solving their puzzles. Also, the next puzzle they offer is of kind I detest: trying to find next number in sequence. I hate when people ask something like this on interviews.

So, being dissapointed for being sent to wild goose chanse without any gratification, I decided to share the answer to their first problem. I hope search engines pick up this page soon and they will have more potential candidates knocking on the door of their second level.

The prime they were asking for is 7427466391.

I will apprecite if somebody who will get through all their puzzles will tell me what it was about.

UPDATE (September 2004): I would like to thank all of you who took their time to let me know that this is Google recruitment campaign. After solving second part of the puzzle I was able to see that for myself. So if you are looking for the answers: your got them right here. You are welcome to read the rest of my blog (or even subscribe to new posts with RSS).
Current Mood:
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[User Picture]
On July 10th, 2004 07:45 am (UTC), bird_owl commented:
All I can say these numbers are sequences of digits of E.
You can check it there --
[User Picture]
On July 10th, 2004 07:59 am (UTC), bird_owl replied:
offsets --

f(1) = 0
f(2) = 4
f(3) = 22
f(4) = 98

— On July 10th, 2004 09:12 am (UTC), notbrainsurgery posted a reply · Expand
— On July 10th, 2004 07:27 pm (UTC), bird_owl posted a reply · Expand
— On July 26th, 2004 01:37 am (UTC), (Anonymous) posted a reply · Expand
— On August 14th, 2004 08:51 am (UTC), (Anonymous) replied, “Accually the answer is...” · Expand
— On August 26th, 2004 11:36 pm (UTC), (Anonymous) replied, “Re: Accually the answer is...” · Expand
— On August 31st, 2004 07:00 pm (UTC), supersaucy replied, “Re: Accually the answer is...” · Expand
— On September 16th, 2004 09:13 pm (UTC), (Anonymous) replied, “Re: Accually the answer is...” · Expand
— On September 16th, 2004 04:21 pm (UTC), (Anonymous) replied, “Re: Accually the answer is...” · Expand
— On September 17th, 2004 10:55 am (UTC), (Anonymous) replied, “Re: Accually the answer is...” · Expand
— On September 19th, 2004 03:44 am (UTC), (Anonymous) replied, “Re: Accually the answer is...” · Expand
— On August 11th, 2007 01:33 am (UTC), (Anonymous) replied, “Re: Accually the answer is...” · Expand
— On September 16th, 2004 04:22 pm (UTC), (Anonymous) posted a reply · Expand
— On December 23rd, 2007 12:03 am (UTC), (Anonymous) posted a reply · Expand
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[User Picture]
On July 11th, 2004 02:52 am (UTC), vzaliva commented:
Somebody else cracked this one as well:


They also did some digging and apparently server hosting web page is somewhere at google. Frankly I suspected that Google behind this from the very beginning.

On July 16th, 2004 10:28 am (UTC), (Anonymous) replied:
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On July 16th, 2004 04:01 pm (UTC), formerjbug commented:
If anyone actually wants to solve them without knowing what it's for, don't read this comment.

http://www.google.com/googleblog/ Has your answer. It's a Google hiring campaign. They want the smartest minds around, and that's how they find them.
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On July 19th, 2004 09:48 am (UTC), (Anonymous) commented:
google is hiring and wanted a way to attract the right people.. :) you can read about it in the google blog.
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[User Picture]
On July 21st, 2004 07:23 pm (UTC), searover commented:
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[User Picture]
On July 23rd, 2004 09:26 pm (UTC), ikyschd commented:
On July 29th, 2004 12:54 am (UTC), (Anonymous) replied:
The Answer is Here... Puzzle Solved
Check out this link posted by me.

This is the answer to all your questions.

Cheers !!!

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[User Picture]
On August 17th, 2004 04:40 pm (UTC), westbaymonument commented:
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On August 18th, 2004 09:58 pm (UTC), (Anonymous) commented:
I found this site by using google.. you asked for the link if someone found the way through the puzzle... I didnt, but these guys did: http://google-blog.dirson.com/post.new/0143/

Also, theres a post on the google blog: http://www.google.com/googleblog/2004/07/warning-we-brake-for-number-theory.html

your welcome.
On August 18th, 2004 11:30 pm (UTC), (Anonymous) replied:
Re: hey
oops... comments didnt show up untill I made the post.. whatever...
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On August 20th, 2004 01:41 pm (UTC), (Anonymous) commented:
as you probably know it was Google looking for big-brains employee

this is the final page (http://www.google.com/labjobs/index.html)
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[User Picture]
On August 25th, 2004 02:24 pm (UTC), jonasaurus commented:
google riddles
my names jon and the billboard is from the site google.com and they are looking for a way to find smart engineers for their company...
On August 26th, 2004 09:04 pm (UTC), (Anonymous) replied:
Re: google riddles
smart at using their search engine or actually being able to solve the riddle?
— On September 5th, 2004 04:15 am (UTC), (Anonymous) replied, “Re: google riddles” · Expand
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On September 7th, 2004 03:39 am (UTC), (Anonymous) commented:
it's a recruitment thing
the billboard was set out by Google to recruit engineers.

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On September 14th, 2004 09:28 pm (UTC), (Anonymous) commented:
It is all about
The signs are about Google. It is a new job campgin they have.
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[User Picture]
On September 16th, 2004 03:54 am (UTC), temporarypacify commented:
hah thank you very much, that just earned me 20 points extra credit
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On September 16th, 2004 10:36 am (UTC), tajjy commented:
I know what it's about!
from www.google.com/googleblog

In other words, the billboard (which offers problem-solvers the URL to, sorry, a page containing an even harder problem), is a recruiting campaign. We've always worked hard to hire the smartest engineers we can find, and we thought this would be a cool way to find a few more.

Yeah, it's another one of those wacky things google does, in this case, a recruiting campaign. Now I'm hooked, and thanks for telling me what the prime was (I was googling for the answer out of laziness :P)
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