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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The number of primes and the number of semiprimes up to 33 are equal. [Gupta] The smallest run of 3 consecutive integers that are semiprimes (the product of two primes) begins with 33. [Wells] The smallest palindromic number n such that inserting a digit '1' between adjacent digits of n is prime. [Russo] First exponent to yield 3 generalized cullen primes: 33*4^33+1, 33*14^33+1 and 33*34^33+1 [Chun Wa] The smallest triadic semiprime. [Capelle] The largest known number (coincidentally semiprime) that is not the sum of two semiprimes. [Capelle] The smallest odd number n such that n+x! is not a prime, for any number x. [Loungrides]
(There are 3 curios for this number that have not yet been approved by an editor.)
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