IBM Research | Ponder This | September 2015 solutions
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September 2015

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The best solution, for the first 4 cases, is the Fibonacci sequence (2; 2,3; 2,3,5; 2,3,5,8).

For 8 teams, we can do better by choosing powers of 2 +1 and fixing the end: 2,3,5,9,17,33,65,70; but there is an even better solution: 2,3,5,8,16,24,54,78. This is the optimal one.