Erdős problem 249 · problems.science

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

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Problem row: sha256:6f9f120f21065958efda6fc6967ba5586c7923b677a0a55b43c9a3523c44ce51
Metadata: sha256:86d261bd1479cb1ac0dd26ec5a66363777d914a2fde0201569ea635087f63fd3
Observation: sha256:8c823d621b7e1256c8e47c60a5f1c54c016a5507e6f27b2bab537f6f5f232067
Content: sha256:8e3b3d2550bc74157481c6dbc293604ac450444e72a817c8486867b96788fae8

Repository: sha256:a956b84c437202e5a02cc9e036a621bd14a302b34a75758115730bdbb77c52a4
Projection: sha256:c9d14c459c518937e758918b5897dc3b22f1a55f07739afe99502f5b046c907a
Source commit: 2415f78e850aeee50afdca525c6f2e0ea606f207