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Erdős problem 257

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Let A⊆NA\subseteq\mathbb{N} be an infinite set. Is ∑n∈A12n−1 \sum_{n\in A} \frac{1}{2^n - 1} irrational?

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Problem row
sha256:7493482876a1193d29943debea1b43ef0d62e14112ab0090891f7095ab018418
Metadata
sha256:1cd23cfdef14ea9176424211cb3ffef1c58cbbc6088d1113df78bb9af30f71f4
Observation
sha256:9c8326e865b6017b103af7611c852a06776d81964979b8ab5a1b800cd550dff6
Content
sha256:454c9a676460b56cd730943fbfd7801640d8efc96e88f4fe71f9c9fc41b6d038
Repository
sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
Projection
sha256:a4a96441668a9f8b33afbcb3f696a2639f5fae145f36ddc063d7f67d5fb87ce8
Source commit
36c6d0fef71a3fec84d9dcd5eeca4e22e378f7cb
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