MathDB

Erdős Problem #249 — Is ∑nϕ(n)2n\sum_n \frac{\phi(n)}{2^n} irrational?

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

References

Primary source

ULAM AI, UnsolvedMath dataset, Erdős Problems set, revision b9437975f3c873f635a13c48f8b022f5ba80898a; CC BY 4.0.

Additional references

UnsolvedMath, Erdős Problems set, ULAM AI, licensed CC BY 4.0.

irrationalitynumber-theory
InErdős Problems
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