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The largest 4digit prime that can be formed by the concatenation of two 2digit primes (97 and 67). [Sladcik]
(9767, 9769) is the first case of a twin prime pair that can be represented as the product of a repdigit number and all its truncations minus 1 and plus 1, i.e., 222*22*21=9767 and 222*22*2+1=9769. [Loungrides]
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