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Polls Search | WeChall->Challenges->Challenge: Prime Factory->Clarification Request
Clarification Request
[Unknown User]Translate with Google2008.Apr.10-00:14:15
What does digit sum exactly means?

1- Sum the digits on both numbers and check the result is prime?
2- Sum the digits in each number and check both results are prime?
3- Sum corresponding digits and check all results are prime?
4- Anything else?

from Germany theAnswer
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Translate with Google2008.Apr.10-00:56:08
2)

from United Kingdom Degenerate
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Translate with Google2009.Feb.04-15:15:39
oh dear.

I have just gone to quite a high number of primes doing the sum of the 2 numbers.

Time to recode it...

from Unknown felinewave
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Translate with Google2009.Feb.16-17:34:07
Hi,

You say that the right answer is number 2. Then why 1000099 and 1000121 aren't ok ? I mean they are the first two to be prime number with sums which are primes too : 1+9+9 = 19 (prime) and 1+1+2+1 = 5 (prime)

Thx, Romain

from Germany TheHiveMind
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Translate with Google2009.Feb.16-17:51:47
Simply because they are not the first two primes to fulfil the constraints.

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