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Find the largest set of stricly positive integer terms in which none divides another and respecting the following rule: given any three of them, one divides the sum of the other two.

Source: diophante.fr

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closed as off-topic by JMP, Beastly Gerbil, Nautilus, Mithrandir, boboquack Feb 19 '18 at 20:16

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question is off-topic as it appears to be a mathematics problem, as opposed to a mathematical puzzle. For more info, see "Are math-textbook-style problems on topic?" on meta." – JMP, Beastly Gerbil, Nautilus, Mithrandir, boboquack
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