# 0

This number is neither prime nor composite.

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Zero is the smallest of the *k*-digit numbers whose digit(s) are the number of distinct prime factors in each of the following

*k*integers. The sequence begins 0, 1, 12, 21, 22422, 24223, 33333, 34441524, 4242436235, 23443535352, 34462443242, 35256523324, 4341535435353, 4645441523344, 5244526446515, 5335524234335, ... .

Submitted: 2018-12-17 00:49:03; Last Modified: 2019-01-05 18:57:32.

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