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+ A left-truncatable prime. [Wood]

+ A prime concatenated from the index of a prime p and p itself, i.e., the 23rd prime is 83. [Loungrides]

+ The number of delegates needed to become the presidential nominee for the Democratic Party of the United States of America. It is exactly half the number of total delegates, plus one. [Jones]

(There is one curio for this number that has not yet been approved by an editor.)




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