601
This number is a prime.
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The one hundredth positive integer that contains exactly one zero. [Gaydos]
601 is the (10^n)-th prime that contains exactly n zeros, case n=1. The sequence begins 2, 601, 40099, 2009407, 100813007, 5726000003, 204000172007, ... . [Gaydos]
(There are 3 curios for this number that have not yet been approved by an editor.)
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