Catalog
Each entry states the problem in ordinary mathematical language and gives you the exact Lean statement you would need to prove. Nothing is paraphrased, so what you read is what gets checked.
Number theory
WithdrawnDate added
Withdrawn 5 Aug 2026
SOURCE_MISMATCH + EXPLOITABLE (the informal problem asks for real convergence; Lean states Summable over ℚ, so failure of ℚ-summability does not establish real divergence; the counterexample exploited this domain mismatch)
Read the recorded decision1 proof submitted, last month
Formal statement
Proof target
import FormalConjectures.ErdosProblems.«15»
import TaskSupport
namespace Bounty
theorem target : fcTypeOfName% "Erdos15.erdos_15" := by
sorry
end Bounty
Original conjecture (Lean type)
True ↔ Summable fun k => (-1) ^ (k + 1) * (↑k + 1) / ↑(Nat.nth Nat.Prime k)Original conjecture source: FormalConjectures/ErdosProblems/15.lean
References
Something wrong with this formalization?
A statement that does not faithfully capture the original conjecture is the one real risk here, so we would rather hear about it early - before someone spends weeks on it.
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Reward
Not quoted
The API has no live estimate for this target right now. That is not the same as zero - it means the figure is unknown, so none is shown.
This problem is closed. Recognised pieces that helped get there are payable from the contribution pool.
Not earning right now
This target was pulled from the pool, so nothing can be earned against it.
Set by bounty policy dynamic-age-v2-locked: the amount is worked out from how long the problem has stood open, so it moves as the pool and the pool's age profile move.