12222...22221 (81-digits)
This number is a prime.
1 2222222121
2222212221 2221222221 2122222221 2222222121 2222212221 2221222221 2122222221
Single Curio View: (Seek other curios for this number)
The only X-prime of order 9. [Loungrides]
Submitted: 2009-08-27 15:29:38; Last Modified: 2014-08-30 15:16:45.
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