This number is a prime.

                                                        112233445 5667788991

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Place 1 after the concatenation of the 9 digits duplicated and obtain a 19-digit prime, whose sum of digits is the 91 appearing the end of the prime. [Silva]

Submitted: 2011-05-15 08:25:24;   Last Modified: 2018-04-19 08:41:40.
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