9

This number is a composite.

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Smallest composite number n whose number of circular loops equals omega(n), i.e., the number of distinct primes dividing n. Circular loops occur in the digits 0, 6, 8, or 9 only. Note that the digit 8 contains two loops. The sequence begins 9, 16, 18, 28, ... . [Honaker]

Submitted: 2020-07-07 10:33:34;   Last Modified: 2020-07-07 10:49:08.
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