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(another Prime Pages' Curiosity)
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19 is the smallest super-2 number (curiously prime), i.e., an integer n such that 2n^2 contains 2 consecutive 2s in its decimal representation. [De Geest]

 

  Submitted: 2004-02-17 08:39:26;   Last Modified: 2008-01-30 11:28:00.



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