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This number is a probable-prime (likely to be a prime but we have not (re-)proven it on this site).
A near-repunit titanic prime consisting of one thousand, four hundred fifty-one 1's followed by a digit 9 found in the sequence of primes: 19, 11119, 111119, 11111119, 11111111111111119, 11111111111111111111111111111111111111111111111119, etc. [Bajpai]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell