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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The smallest prime (emirp) formed by concatenating the sum and the product of digits of a number n, with the number n, (case n=21). Shall we call 3221 an SPn prime? [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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