This number is a prime.

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+ Lucas number L(532277), a number of 111240 digits, was found by R. Lifchitz in March 2004 to be a probable prime. 532277 is itself a prime. Note that 532277 is the sum of a semiprime squared and a prime to the 4th power: 532277 = (2 * 317)^2 + 19^4. [Post]

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