90909...09091 (30-digits)
This number is a prime.
9090909090 9090909090 9090909091
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Fourth prime of the form (10^P + 1)/11, where P is prime.
The first seven primes of this form are for P = 5, 7, 19, 31, 53, 67 and 293. [Matson]
Submitted: 2002-05-03 00:41:17; Last Modified: 2008-01-30 17:28:00.
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