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The number 222^{2} + 222^{22} + 222^{222} + 1 is prime. [Patterson]
222 is the smallest repdigit 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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