Prime Curios!: 489

489
(another Prime Pages' Curiosity)

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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.)

Submitted: 2004-03-26 17:06:48; Last Modified: 2008-01-30 11:28:00.