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Erdős problem 250

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Is ∑n=1∞σ(n)2n \sum_{n=1}^\infty \frac{\sigma(n)}{2^n} irrational? Here σ(n)\sigma(n) is the sum of divisors function.

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Problem row
sha256:d9dec9fc0c4daa09d6022bb267c7e45ab6b6917d84b045d79a66f1fb6b40de77
Metadata
sha256:919717d2cfabd5b58e1207adbfd6824bb0ec0ecce1fb05045486dada75a59ca1
Observation
sha256:9c8326e865b6017b103af7611c852a06776d81964979b8ab5a1b800cd550dff6
Content
sha256:bc070c8cf86f4d02fcbc66793b9a062515687deeef323784eff0e7146ea905d8
Repository
sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
Projection
sha256:a4a96441668a9f8b33afbcb3f696a2639f5fae145f36ddc063d7f67d5fb87ce8
Source commit
36c6d0fef71a3fec84d9dcd5eeca4e22e378f7cb
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