17777...77777 (121-digits)
This number is a prime.
1 7777777777 7777777777 7777777777 7777777777 7777777777
7777777777 7777777777 7777777777 7777777777 7777777777 7777777777 7777777777
Just showing those entries submitted by 'Bajpai': (Click here to show all)
A near-repdigit prime P consisting of a digit 1 followed by
one hundred-twenty 7's found in the sequence of primes 17,
1777, 1777777777, 17777777777777,
1777777777777777777777777777777777777777777, etc.
Curiously, the number of digits (121) and sum of digits
(841) of P are both perfect squares. [Bajpai]
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