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Erdős problem 249

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Is ∑nϕ(n)2n\sum_{n} \frac{\phi(n)}{2^n} irrational? Here ϕ\phi is the Euler totient function.

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Problem row
sha256:6f9f120f21065958efda6fc6967ba5586c7923b677a0a55b43c9a3523c44ce51
Metadata
sha256:86d261bd1479cb1ac0dd26ec5a66363777d914a2fde0201569ea635087f63fd3
Observation
sha256:9c8326e865b6017b103af7611c852a06776d81964979b8ab5a1b800cd550dff6
Content
sha256:8e3b3d2550bc74157481c6dbc293604ac450444e72a817c8486867b96788fae8
Repository
sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
Projection
sha256:a4a96441668a9f8b33afbcb3f696a2639f5fae145f36ddc063d7f67d5fb87ce8
Source commit
36c6d0fef71a3fec84d9dcd5eeca4e22e378f7cb
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