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]

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

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