You will use a 32-player-draw for 23 tennis players, so you will have 9 byes (32-23=9). There should be 1 seed for every 3 unseeded players for a 32-player-draw, so 23/(1+3)=5.75 and then = 6 seeds.
You can use the same way to find out the number of seeds for a 16-player-draw. If you use a 64-players-draw, you have to divided by 8, which means 1 seed for every 7 unseeded players.
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