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Puzzle ZTKF 


X Support Cup It is now four years since I first asked for support, and I would like to sincerely thank everyone who has helped me. BrainBashers doesn't show adverts, and I continue to depend on the ongoing support from everyone who enjoys the site.
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What number comes next in this sequence:

2 · 5 · 9 · 19 · 37 · ?

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