Erdős Problem #321
What is the largest $A\subseteq\{1,\dots,N\}$ such that all subset sums $\sum_{n\in S}1/n$ (over $S\subseteq A$) are distinct?
Exact FrontierDelta
Scope and record
Occurred: Jul 1, 2026
Delta type: SOURCE CLAIM
Assumptions: VibeMathed verification: site-confirmed. Publication: announcement. AI contribution: ai-discovered. Imported under CC BY 4.0.
Canonical aliases: Erdős Problem #321 · Erdős #321 · Problem 321
Confidence: Not scored
Registry verification: site confirmed · announcement · resolved
Attribution
VibeMathed
registry · event recorded by
Young
human · human collaborator
Zhu
human · human collaborator
Luo
human · human collaborator
GPT-5.6 Sol
model · ai model contributor · OpenAI
Lineage and corrections
This event attributed to Young
This event attributed to Zhu
This event attributed to Luo
This event attributed to GPT-5.6 Sol