Prime Curios!: 1280

1280
(another Prime Pages' Curiosity)

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The numbers 6*1280+1, 12*1280+1, and 18*1280+1 are all prime. Hence their product is 2718439856641 which is the smallest Carmichael number that uses all of the first nine digits. [Patterson]

Submitted: 2002-10-04 14:03:01; Last Modified: 2008-01-30 11:28:00.