1

This number is a unit (so is neither prime nor composite).

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The smallest number n such that 10n + 1, 10n + 3, 10n + 7 and 10n + 9 are all primes. [Firoozbakht]

Submitted: 2004-08-18 03:12:12; Last Modified: 2008-02-06 20:44:31.