This number is a prime.
The 2423 Hillside Observation Passenger Car is part of the Lionel Lines set of the early to mid 1950's.
(24, 23, 22, 21) is the monadic case of four consecutive
double-digit numbers such that concatenating them two-two
in descending order, we create two primes, i.e., 2423 and
2423 is the largest in a list consecutive distinct primes
of the form (671n mod2454)+(304n mod32)+(4373n mod199),
where n=1 to 38. Found by Dmitry Kamenetsky. See PP&P Connection.
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