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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) A palindromic prime equal to the sum of the reversals of three consecutive primes: 7237, 7243, 7247 (18181 = 7327 + 3427 + 7427). [Silva] The smallest almost plateau prime. (An almost plateau prime is a palindromic prime of the form abb...bab...bba, where a is smaller than b.) [Loungrides] The smallest palindromic prime formed by concatenating n, n, and 1. [Devesh] 18181 is strobogrammatic and well as a tetradic prime. [Bajpai] The only palindromic prime P that is the sum of the squares of the first n oban numbers, i.e., (3^2 + 5^2 + 6^2 +...+ 39^2 + 50^2), (case n=30). Curiously, sod(P) is the smallest invertible prime. [Bajpai]
(There is one curio for this number that has not yet been approved by an editor.)
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