This number is a prime.

+ The ZIP Code of the U.S. Supreme Court (1 First Street, N.E., Washington, D.C. 20543).

+ 20543 is the smallest prime that generates three more primes by reiterative use of the following rule: next integer is equal to the sum of each digit powered to that digit, from the previous integer. The sequence goes this way: 20543, 3413, 311, 29. 0^0 = 1. No larger sequence of this type is known. [Rivera]

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