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This number is a prime.
49 9887766554 4332211001
The only prime formed by inserting between the digits of a double-digit number, the concatenation in reverse order of all the repdigit double-digit numbers 99, 88, ..., 11, 00. [Loungrides]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell