19

This number is a prime.

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The sequence of smallest odd prime numbers with exactly n circular loops begins 19, 83, 89, 809, 1889, 8089, ... . Circular loops occur in the digits 0, 6, 8, or 9 only. Note that the digit 8 contains two loops. [Mutter]

Submitted: 2020-01-31 12:29:09; Last Modified: 2020-02-26 19:36:35.