1399
This number is a prime.
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The consecutive primes 1399 and 1409 have the property that
1399*1409 +/- (1399+1409) are both prime. Moreover,
7^1399-6^1399 is prime, and so is (12*10^1399-21)/99 =
1212...2121, a smoothly undulating palindromic prime with
1399 digits. [Hasler]
Submitted: 2009-04-05 03:03:16; Last Modified: 2009-04-05 03:45:33.
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