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Problem 68 — Erdős Problems

Problem 68

Is

\sum_{n\geq 2}\frac{1}{n!-1}

irrational?

Source: erdosproblems.com/68

Number theory
Irrationality

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No claim settles this problem.

Er88c: Erdős, P., On the irrationality of certain series: problems and results. New advances in transcendence theory (Durham, 1986) (1988), 102-109.

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Status: Open
Topics: Number theory
Irrationality
In the wiki: Wiki page