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19700Fun with 1,2 and 3.

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  • Mark Underwood
    Nov 12, 2008
      The 4 numbers 1, 3*2^1, 3*2^2 and 3*2^3 (1,6,12,24) have all eight of their additive
      combinations prime: 5,7,17,19,29,31,41, and 43.

      Mark