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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The smallest prime that can be represented as the sum of a prime and its reversal in three different ways. [Gupta] The last "prime day" of the year is 12/31. [Hallyburton] The smallest mountain emirp. [Loungrides] The last two prime days of the year, 12/29 and the New Year's Eve prime, 12/31, form a 'twimirp' (a twin prime pair whose members are emirps). Submitted on 12/31. [Green] There are exactly 1231 isomers of undecene (C_{11}H_{22}). [Gudipati] The smallest prime (emirp) of form x+R(x) where x is a prime and R(x) its reversal, in three ways, i.e., 1231 = 269+962 = 467+764 = 863+368. [Loungrides]
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