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 Prime Perimeter (Posted on 2005-03-11)

You and two other people have numbers written on your foreheads. You are all told that the three numbers are primes and that they form the sides of a triangle with a prime perimeter. You see 5 and 7 on the other two heads and both of the other people agree that they cannot deduce the number on their own foreheads.

 See The Solution Submitted by Erik O. Rating: 2.8235 (17 votes)

 Subject Author Date No Subject George Ambrose 2022-10-12 04:02:02 answer K Sengupta 2007-03-14 04:06:06 re: Solution Jacob 2005-05-20 21:02:28 re: Solution (to Briana) pcbouhid 2005-04-25 21:12:13 Solution Briana 2005-04-23 02:35:31 too simple ravikumar 2005-04-22 04:44:33 Solution (long) Eddy Karat 2005-04-13 22:08:34 re(2): full solution Sue Levy 2005-04-10 16:41:45 re(3): THERE IS NO SOLUTION! Dustin 2005-04-09 02:55:50 re(2): THERE IS NO SOLUTION! jon 2005-04-09 01:30:25 re: THERE IS NO SOLUTION! Dustin 2005-04-09 00:44:59 THERE IS NO SOLUTION! jon 2005-04-09 00:11:17 THERE IS NO SOLUTION! jon 2005-04-09 00:11:11 re(2): A solution to Pat jon 2005-04-08 23:28:55 re: No Subject - To Samara pcbouhid 2005-04-05 18:54:32 No Subject Samara 2005-04-05 17:21:49 re: A solution to Pat pcbouhid 2005-04-05 16:07:25 A solution Pat Whitaker 2005-04-05 01:34:25 to jason, why your answer is wrong Michael 2005-04-04 12:00:27 re: prime perimeter gary wallravin 2005-03-27 20:01:44 re: prime perimeter - To Jason pcbouhid 2005-03-27 13:22:06 re: prime perimeter pcbouhid 2005-03-26 21:07:59 prime perimeter jason 2005-03-26 02:58:33 re: Prime Perimeter gary wallravin 2005-03-22 18:58:22 re(2): solution gary wallravin 2005-03-22 18:51:04 Prime Perimeter Brunner, J 2005-03-22 14:51:23 No Subject david 2005-03-22 13:16:18 trying to solve ChandraKumar Desai 2005-03-21 05:45:58 re: solution em 2005-03-21 02:20:42 solution gary wallravin 2005-03-20 20:44:31 No Subject rachael 2005-03-18 02:56:18 re: No Subject (emdad) pcbouhid 2005-03-16 12:25:49 No Subject emdad 2005-03-16 10:25:39 re(3): centering the point pcbouhid 2005-03-15 15:49:59 re: No Subject pcbouhid 2005-03-15 15:25:03 solution nitin 2005-03-15 07:53:11 No Subject emdad 2005-03-14 22:04:02 re(2): centering the point armando 2005-03-14 21:46:09 No Subject emdad 2005-03-14 21:37:39 re(2): 5,5,9--7,7,9--7,7,13 john 2005-03-14 17:42:51 re(6): Trying to solve this... pcbouhid 2005-03-14 17:02:24 re: 5,5,9--7,7,9--7,7,13 pcbouhid 2005-03-14 16:57:33 re(5): Trying to solve this... pcbouhid 2005-03-14 16:53:47 unique? john 2005-03-14 15:35:08 5,5,9--7,7,9--7,7,13 john 2005-03-14 15:24:47 re: full solution john 2005-03-14 15:04:18 re: solution? john 2005-03-14 14:38:55 re(4): Trying to solve this... Tristan 2005-03-14 00:50:01 re: centering the point pcbouhid 2005-03-13 23:30:06 re(3): Trying to solve this... pcbouhid 2005-03-13 23:22:34 re(2): Trying to solve this... Tristan 2005-03-13 22:06:15 re: Trying to solve this... pcbouhid 2005-03-13 21:07:54 re: centering the point pcbouhid 2005-03-13 20:54:36 centering the point armando 2005-03-13 09:56:43 re: Erick Please Clarify Tristan 2005-03-13 02:10:23 Trying to solve this... Tristan 2005-03-13 01:50:45 solution Kyle Mooney 2005-03-12 18:17:03 re(2): Charlie's Skepticism Eric 2005-03-12 17:00:06 re: Charlie's Skepticism Charlie 2005-03-12 14:09:04 re(2): still another word Rex 2005-03-12 07:58:33 re: one word more Rex 2005-03-12 07:57:33 one word Rex 2005-03-12 07:55:20 Charlie's Skepticism Eric 2005-03-12 05:23:59 Erick Please Clarify Sachin 2005-03-12 05:12:38 re(4): full solution as understood Sachin 2005-03-12 05:10:38 re(3): full solution as understood Sachin 2005-03-12 04:11:29 re: No Subject Donna 2005-03-12 03:35:14 No Subject jenny 2005-03-12 03:32:20 re(3): full solution as understood Sachin 2005-03-12 03:06:51 re(2): full solution as understood Charlie 2005-03-12 03:01:36 re: full solution as understood Sachin 2005-03-12 02:00:00 solution Danielle 2005-03-12 01:31:25 Triangles and Primes - Gordon Steel 2005-03-12 00:56:14 re: full solution Sachin 2005-03-11 23:18:29 re: full solution Mike 2005-03-11 22:41:05 re(3): full solution - to Hugo again pcbouhid 2005-03-11 21:55:26 re(2): full solution - to Hugo again pcbouhid 2005-03-11 21:52:53 re(2): full solution - To Hugo pcbouhid 2005-03-11 21:48:53 re(2): full solution pcbouhid 2005-03-11 21:44:45 re: full solution Hugo 2005-03-11 21:41:05 re: full solution Mike 2005-03-11 21:09:50 re(2): full solution pcbouhid 2005-03-11 21:02:34 re: full solution Charlie 2005-03-11 20:35:47 full solution pcbouhid 2005-03-11 19:27:14 re(3): Semi-Solution? Sachin 2005-03-11 19:17:15 re(2): Semi-Solution? Richard 2005-03-11 19:14:59 So far .... Sachin 2005-03-11 18:54:47 re: Semi-Solution? Charlie 2005-03-11 18:26:51 Semi-Solution? lauren 2005-03-11 17:42:13 solution? john 2005-03-11 17:28:25

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