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489 is the smallest number ending in 1, 3, 7, or 9 that cannot be made prime by adding any multiple of 100 up to 700. (I.e., 589, 689, 789, 889, 989, 1089 and 1189 are all composite.)
To link to this page use http://primes.utm.edu/curios/page.php?number_id=4211
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