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.
What is the number written on your forehead?
| |
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 |
