# 666666

$t_title is "666666"

$t_adjust_path is "/~caldwell/curios/"

$t_class is "composite"

$nunber_id is "7724"

$t_meta['description'] is "One of many pages of prime number
curiosities and trivia. This page discusses 666666
Come explore a new prime today!"

The only six-digit repdigit such that the sum of itself and all truncations of itself plus one is an emirp. [Bajpai]

The only 6-digit repdigit number such that the product of itself and all truncations of itself plus one is prime, i.e., 666666*66666*6666*666*66*6+1 and at the same time the concatenation of all the above digits, i.e., 6666666666666666666661, is also prime. [Loungrides]

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

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