Prime Curios!: 901

901
(another Prime Pages' Curiosity)

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The only three-digit composite number (901 = 17*53) with a middle zero that gives only primes (9001, 90001, 900001), when up to three zeros are added in the middle.

Submitted: 2003-10-26 18:26:09; Last Modified: 2008-12-28 16:24:46.