# 3581

This number is a prime.

The smallest prime *p* for which all the decimal digits of
31*p* are either zeros or ones (31 * 3581 = 111011). The next
few primes of this type are 3583871, 32290681, 326132581,
... . [Keith]

(There is one curio for this number that has not yet been approved by an editor.)

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