12121...12121 (1399-digits)

This number is a prime.

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The number (12*10^1399-21)/99 = 1212...2121 is a smoothly undulating palindromic prime of prime length (1399 digits). [Hasler]

Submitted: 2009-11-30 01:02:51; Last Modified: 2009-12-02 02:38:44.