Carmichael Number has 3 Odd Prime Factors/Historical Note
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Historical Note on Carmichael Number has 3 Odd Prime Factors
Robert Daniel Carmichael proved that a Carmichael Number has at least 3 distinct odd prime factors in $1912$, at around the same time that he discovered that $561$ was the smallest one.
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $561$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $561$