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The smallest prime (emirp) formed by concatenating the sum of digits, the product of digits, and the number n of a multidigit number n, (case n=21). [Loungrides]
The smallest emirp with a partition into three consecutive emirps (1061 + 1069 + 1091) that concatenate to a prime (106110691091). Note that the latter nonprimedigit prime derives from a noncompositedigit emirp. [Beedassy]
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