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Andrew | all galleries >> More Photo a Day galleries >> A Photo a Day - October 2006 > 30th October: How many primes (question 2)?
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30th October: How many primes (question 2)?

30th October: How many primes (question 2)?

Shanghai, China

The correct answer to yesterday's question was 5 - congratulations to Sunny.

I've no idea what the right answer is today.


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Andrew 07-Nov-2006 18:02
I thought 13916168731 was a prime - but I forgot that it's 4651 x 2992081. Silly me!
Steve Roden 06-Nov-2006 20:53
ok. let me start - first up: 13916178011 is prime...
Peter 01-Nov-2006 17:15
The answer is "lots". Sunny knows but doesn't want to say.
Echo 01-Nov-2006 15:48
Prime Obsession!
I wonder if Steve will figure this out. But there could be another big question for everybody if he makes it---to check the answer.
Victoria 01-Nov-2006 06:29
Wow,it is super question which depend on the permutation and combination you choose, too many ...I agree with Sunny,leave this to Pete
Dan Chusid 01-Nov-2006 02:33
12?
No idea really!
Sunny 01-Nov-2006 01:23
I would like to leave this question to Pete this time.