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Erdős Problem #469

Erdős problem #469 · erdosproblems.com/469

Does the sum of the reciprocals of all primitive pseudoperfect numbers converge?

Result
Proved
Status
Resolved
AI contribution
AI co-developed
Method
Argument
Field
Number Theory, Divisors
Posed by
Year posed
Years open
Solved
2026-07-21
Model
GPT-5.6 Sol Ultra, Claude Fable 5
Vendor
OpenAI / Anthropic
Collaborators
Zachary J. Lewis
Verification
Lean-verified
Publication
Announced
Significance
10 / 100
Disclosed cost
Wikipedia
No dedicated article

What the AI did

The public proof, which also yields density results for pseudoperfect numbers, was developed with GPT-5.6 Sol Ultra and reviewed with Claude Fable 5.

Verification

Lean-checked in two independent public developments.

Source

erdosproblems.com/469

Discussion