Supposed you are given the following numbers:

  • 6
  • 28
  • 496
  • 8128
  • 33550336
  • 8589869056

What's the relation between them?


closed as off-topic by QuantumTwinkie, JonMark Perry, Rand al'Thor, El-Guest, Quintec Sep 18 '18 at 19:07

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  • "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." – QuantumTwinkie, JonMark Perry, Rand al'Thor, El-Guest, Quintec
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  • 2
    $\begingroup$ This is not really a puzzle. Generally one should avoid sequences that are easy to find on OEIS, especially well known mathematical ones. It then becomes just a trivia question. $\endgroup$ – Jaap Scherphuis Sep 18 '18 at 16:50

They are all

Perfect numbers because the numbers are equal to half of the sum of their divisors.


28 -> (1+2+4+7+14+28)/2 = 28


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