Prime Curios!: 222

222
(another Prime Pages' Curiosity)

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

The smallest palindromic composite number n such that 9*n+1 is prime. [Russo]

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]

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