1122334455667788991

This number is a prime.

112233445 5667788991

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(1122334455667788991, 1122334455667788997) is a sexy prime pair formed by doubling each counting digit in order and attaching at the end respectively the digits 1 and 7. [Loungrides]

Submitted: 2015-07-16 17:44:04; Last Modified: 2018-05-25 19:33:17.