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I'm sorry, but I don't have access to specific puzzle answers, including those from "pizzazz D-31." If you provide me with the clues or context, I can help you figure it out or provide guidance!
To move n disks, you need 2n-1moves. In this case, 31.
None of the times tables equal 31.
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One possibility would be 27. I see here on the odd locations a growing series, adding 8 each time: 15 +8 = 23; 23 +8 = 31; 31 + 8 = 39 For the even locations, you could take a diminishing series, subtracting 4 each time: 35 - 4 = 31; 31 - 4 = 27.