The board / number theory / #856
Erdős Problem #856
OPENdatabase updated 2025-08-31
No proof or disproof is known, and it isn't known whether a finite computation could settle it.
What the community database records, not our verdict. erdosproblems.com no longer shows statuses (why).
Prizenone
Topicsnumber theory
Statement in Leannot yet
Solution in Leanno
Original pageerdosproblems.com/856
Attempts
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The authoritative live page is OPEN and shows “Currently working on this problem: None”, but it lists 1 claimed proof—a full proof claimed by RayYoung, Keheng Zhu, and Yanping Luo, submitted 2026-07-1
SKIPPED