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According to the 2000 Wisden, the prime number 503 was the number of hours of sunshine in England's gloomiest summer of the 20th century (1954). 503^5 + 503^0 + 503^3 is prime. It is the smallest prime with this property. [Firoozbakht] Clark Kent's Metropolis apartment number in the "Superman" series. [Morse] 5! + 0! + 3! is a threedigit Mersenne prime. [Morse] Theatre503 is a performing arts venue in London that specializes in new work. With 509, the smallest pair of consecutive sexy Cyclops primes. [Punches] "503 Service Unavailable" is a HTTP error code that indicates a temporary server failure state due to overload or maintenance. [Beedassy] The smallest prime of the form 2^{x}x, where x is a composite number. [Loungrides]
(There are 4 curios for this number that have not yet been approved by an editor.)
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