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+ The number 2222 + 22222 + 222222 + 1 is prime. [Patterson]

+ 222 is the smallest repunit such that the product of itself and all truncations of itself plus and minus one results in twin primes. I.e., 222*22*2 ± 1 are twin primes. [Opao]

(There are 3 curios for this number that have not yet been approved by an editor.)




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