38

This number is a composite.

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38 = 2 * 19. Note that 3² + 8¹⁹ is prime. [Honaker]

Smallest composite number n whose number of circular loops equals Omega(n), i.e., the number of prime divisors of n counted with multiplicity. Circular loops occur in the digits 0, 6, 8, or 9 only. Note that the digit 8 contains two loops. The sequence begins 38, 58, 68, 69, ... . [Honaker]