86421...11111 (24-digits)

This number is a prime.

8642 1111111111 1111111111

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A prime formed from the concatenation of the positive even digits (in decreasing order) followed by 8+6+4+2 ones. [Silva]

Submitted: 2011-03-16 14:57:00; Last Modified: 2011-03-17 12:20:50.