NPR Sunday Puzzle (Nov 18, 2018): Taking the Next Logical Step

Q: In my trip to Europe two weeks ago I visited a friend in Amsterdam who literally has a puzzle on his doormat. Before you walk into his apartment, there’s an original puzzle for you to solve. I was able to do it. See if you can. What number comes next in this series: 1, 2, 4, 8, 16, 23, 28?

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