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GIMPS has discovered a new largest known prime number: 2^{82589933}1 (24,862,048 digits) The smallest multidigit number that is not the sum of a prime and a power. US Airways Flight 1549 famously splash landed in the Hudson river. 1549 is prime, and, curiously, 15491152009 is also prime, which concatenates the flight number with the flight date 1/15/2009. [Post] 1549 is the smallest number whose square can be split into two primes in three different ways: 1549^2 = 2399401 > 2399 and 401 are primes, 23 and 99401 are primes, and 2 and 399401 are primes. [Meller] The number of different ways a quarter can be tendered in exact change using legal coins produced by the United States Mint since its inception. (Relevant denominations $0.25, $0.20, $0.10, $0.05, $0.03, $0.02, $0.01, and $0.005). [Goelz]
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