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?

theAnswer

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Clarification Request
Apr 10, 2008 - 00:56:08 (16y 45d) Google/translate3Thank You!1Good Post!1Bad Post! link

Degenerate

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Clarification Request
Feb 04, 2009 - 15:15:39 (15y 109d) Google/translate2Thank You!1Good Post!1Bad Post! link

oh dear.

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

Time to recode it...

felinewave

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Clarification Request
Feb 16, 2009 - 17:34:07 (15y 97d) Google/translate2Thank You!1Good Post!2Bad Post! link

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

TheHiveMind

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Clarification Request
Feb 16, 2009 - 17:51:47 (15y 97d) Google/translate2Thank You!2Good Post!1Bad Post! link

Simply because they are not the first two primes to fulfil the constraints.

gizmore

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RE: Clarification Request
Oct 04, 2010 - 16:37:35 (13y 232d) Google/translate3Thank You!1Good Post!1Bad Post! link

This challenge was broken for several weeks, because the solution has been reset to NULL.

If you tried this chall within the last weeks, i am very sorry for any inconvinience.

The reason for this is EditChallenge reset the password to NULL and i hope i did not edit too much challenges, with a static solution.

I will check all static solutions now to be still ok Smile

Edit: Checked all solutions and all other challenges were ok.

The geeks shall inherit the properties and methods of object earth.

Last edited by gizmore - Oct 04, 2010 - 16:54:49

miller2018

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RE: Clarification Request
Oct 08, 2018 - 22:28:18 (5y 226d) Google/translate0Thank You!0Good Post!0Bad Post! link

Quote from Gizmore
Oct 04, 2010 - 16:37:35

This challenge was broken for several weeks, because the solution has been reset to NULL.

If you tried this chall within the last weeks, i am very sorry for any inconvinience.

The reason for this is EditChallenge reset the password to NULL and i hope i did not edit too much challenges, with a static solution.

I will check all static solutions now to be still ok

Edit: Checked all solutions and all other challenges were ok.

miller2018

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RE: Clarification Request
Oct 08, 2018 - 22:38:29 (5y 226d) Google/translate0Thank You!0Good Post!0Bad Post! link

The password this challenge is 10000331000037 ?, thanks

use the Criba de Eratóstenes, is result :
1000003
1000033
1000037
1000039
1000081
1000099
1000117
1000121
1000133
1000151
1000159
1000171
1000183
1000187
1000193

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