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Medium Puzzles 


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Puzzle 265 


What comes next in this sequence:

2 · 3 · 5 · 7 · 11 · 31 · 71 · 91 · ?

Puzzle Copyright © Kevin Stone

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Puzzle 266 


What are the next three letters in this sequence:
HDD
TMRUTC
TCSO
TMRD

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Puzzle 267 


What is the minimum number of queens required on a chessboard such that all squares are attacked?

Queen On C3

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Puzzle 268 


Can you find a valid sentence …

… which has two consecutive ANDs in it?

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