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The smallest prime formed from concatenation of happy numbers. [Gupta] 17 is the smallest prime sandwiched between two nonsquarefree numbers. A number is squarefree if it is not divisible by the square of an integer greater than 1. [Gupta] !17  1 is prime. Note that !17 represents subfactorial 17. [Gupta] !17 is the smallest subfactorial containing all digits from 0 to 9, i.e., pandigital. [Gupta]
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