12341...34123 (55-digits)

This number is a prime.

12341 2341234123 4123412341 2341234123 4123412341 2341234123

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The smallest prime obtained by concatenating the repeated pattern 1234 with a truncated version of this pattern. [Necula]

Submitted: 2004-01-12 19:22:13; Last Modified: 2008-01-30 17:28:00.