HHC 2014 Programming Contest
09-24-2014, 11:24 AM
Post: #5
 David Hayden Senior Member Posts: 340 Joined: Dec 2013
RE: HHC 2014 Programming Contest
An odd number of PDPs happen in pairs when 12/31 and 1/1 are prime, but only when the next New Year isn't also prime. Assume there is a 4 year range. Call the number representing the year before this range X. Now compute the offsets K1, K2, etc. to the supposedly prime days. Take the offsets mod 3 and you find that at least one is 0, 1, or 2. That means that regardless of what X mod 3 is, (X + Kn) mod 3 will be zero for at least one of the Kn's.
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 Messages In This Thread HHC 2014 Programming Contest - Paul Dale - 09-24-2014, 09:13 AM RE: HHC 2014 Programming Contest - Paul Dale - 09-24-2014, 09:31 AM RE: HHC 2014 Programming Contest - Paul Dale - 09-24-2014, 09:41 AM RE: HHC 2014 Programming Contest - Paul Dale - 09-24-2014, 11:46 AM RE: HHC 2014 Programming Contest - David Hayden - 09-24-2014, 12:46 PM RE: HHC 2014 Programming Contest - Paul Dale - 09-24-2014, 09:40 PM RE: HHC 2014 Programming Contest - Joe Horn - 09-24-2014, 03:18 PM RE: HHC 2014 Programming Contest - David Hayden - 09-25-2014, 12:48 AM RE: HHC 2014 Programming Contest - Paul Dale - 09-25-2014, 12:58 AM RE: HHC 2014 Programming Contest - BruceH - 10-02-2014, 09:35 PM RE: HHC 2014 Programming Contest - Paul Dale - 09-24-2014, 09:38 AM RE: HHC 2014 Programming Contest - David Hayden - 09-24-2014 11:24 AM RE: HHC 2014 Programming Contest - Dave Britten - 09-24-2014, 01:39 PM RE: HHC 2014 Programming Contest - Don Shepherd - 09-24-2014, 01:46 PM RE: HHC 2014 Programming Contest - brouhaha - 09-25-2014, 06:12 AM RE: HHC 2014 Programming Contest - Paul Dale - 09-25-2014, 06:54 AM RE: HHC 2014 Programming Contest - Neil Hamilton - 09-27-2014, 04:47 PM RE: HHC 2014 Programming Contest - Don Shepherd - 09-27-2014, 06:50 PM RE: HHC 2014 Programming Contest - Joe Horn - 09-28-2014, 12:08 AM RE: HHC 2014 Programming Contest - David Hayden - 09-28-2014, 01:39 PM RE: HHC 2014 Programming Contest - Neil Hamilton - 09-29-2014, 11:13 AM RE: HHC 2014 Programming Contest - David Hayden - 09-29-2014, 11:35 AM RE: HHC 2014 Programming Contest - Neil Hamilton - 09-27-2014, 06:56 PM RE: HHC 2014 Programming Contest - Don Shepherd - 09-27-2014, 07:44 PM RE: HHC 2014 Programming Contest - Joe Horn - 09-28-2014, 12:16 AM RE: HHC 2014 Programming Contest - Neil Hamilton - 09-28-2014, 11:58 AM RE: HHC 2014 Programming Contest - Joe Horn - 09-29-2014, 12:43 PM RE: HHC 2014 Programming Contest - Jeff O. - 09-29-2014, 01:41 PM RE: HHC 2014 Programming Contest - Joe Horn - 09-30-2014, 01:20 AM RE: HHC 2014 Programming Contest - Jeff O. - 09-30-2014, 04:39 PM RE: HHC 2014 Programming Contest - Jeff O. - 10-06-2014, 05:01 PM RE: HHC 2014 Programming Contest - Paul Dale - 10-06-2014, 09:34 PM RE: HHC 2014 Programming Contest - Jeff O. - 10-07-2014, 12:26 PM RE: HHC 2014 Programming Contest - Thomas Klemm - 09-29-2014, 04:57 PM RE: HHC 2014 Programming Contest - Neil Hamilton - 09-29-2014, 05:27 PM RE: HHC 2014 Programming Contest - Werner - 10-03-2014, 07:35 AM RE: HHC 2014 Programming Contest - C.Ret - 10-05-2014, 10:02 AM RE: HHC 2014 Programming Contest - Werner - 10-05-2014, 08:02 PM

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