Erdős problem 409
If then the iteration necessarily reaches a prime. Note: this is open — it is not clear that the σ iteration always terminates, since it is non-decreasing (unlike the φ iteration which is strictly decreasing).
Nothing has been recorded here yet.
How far the record reaches3 of 6 stages
- Sourceerdos-problems
- StatementRetained
- Formal13 retained
- ResolutionNone filed
- WorkNone recorded
- DecisionNone here
- The questionNot reached
What this record is missingResolution
No source retained here records an outcome for this question.
Its collection still marks it open.
Where the source files it577 share a topic
Erdős problem 321acceptedCarrying a Standing. Browse the topic.