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777777
This number is a composite.
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The only six-digit repdigit such that the sum of itself and
all truncations of itself minus one, i.e.,
777777+77777+7777+777+77+7 - 1 = 864191 is prime. [Bajpai]
Submitted: 2017-04-19 14:02:14; Last Modified: 2020-06-15 19:52:11.
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