666

This number is a composite.

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The smallest "beast quadruplet" (666-digits) is also the smallest "beast quintuplet." (10^665+ 2969689524331 + d, where d = -4,0,2,6,8.) [Luhn]

Submitted: 2017-09-04 18:08:19; Last Modified: 2017-09-04 18:22:20.