12011...11237 (28-digits)

This number is a prime.

12011213 1217122312 2912311237

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1201121312171223122912311237 is the smallest 28-digit prime (which happens to an emirp) formed with seven consecutive increasing four-digit primes. Note that 28 is a perfect number. [Mortreuil]

Submitted: 2004-07-23 13:44:43; Last Modified: 2008-01-30 17:28:00.