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Prime Time Revisited (Posted on 2004-10-22) Difficulty: 2 of 5
Do there exist three 2-digit primes such that:
  • Any two of the three, averaged, produce another prime, and
  • The average of all three is prime

See The Solution Submitted by SilverKnight    
Rating: 3.0000 (8 votes)

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Solution First part : Not so uncommon | Comment 2 of 17 |

The complete list for the first part - 28 sets in all !!!

11   --  23   :   17
11   --  47   :   29
11   --  71   :   41
11   --  83   :   47
13   --  61   :   37
13   --  73   :   43
17   --  29   :   23
17   --  41   :   29
17   --  89   :   53
19   --  43   :   31
19   --  67   :   43
23   --  59   :   41
23   --  71   :   47
23   --  83   :   53
29   --  53   :   41
29   --  89   :   59
31   --  43   :   37
37   --  97   :   67
41   --  53   :   47
43   --  79   :   61
43   --  71   :   57
47   --  61   :   53
47   --  71   :   59
53   --  89   :   71
59   --  83   :   71
61   --  73   :   67
61   --  97   :   79
67   --  79   :   73

Oops: Done too soon... These are just 2 Primes averaging in another new Prime. !!!

Edited on October 22, 2004, 1:44 pm
  Posted by Syzygy on 2004-10-22 13:42:00

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