10000...00101 (190-digits)

This number is a prime.

1000000000 0000000001 0000000000 0000000100 0000000000
0000100000 0000000000 1000000000 0000010000 0000000001 0000000000 0010000000
0000100000 0000010000 0000010000 0000100000 0010000001 0000010000 1000100101

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This prime number is the concatentation of the first 19 powers of 10 in reverse. Note that it has 190 digits, which is 19 times 10. [Hartley]

Submitted: 2003-03-11 08:29:19; Last Modified: 2008-01-30 17:28:00.