The highest point on the territory of Minsk, Belarus is 283 meters above sea level. 283 is prime! [Kulsha]
283 = (6! - 5! - 4! - 3! - 2! - 1! - 0!)/2. [Vatshelle]
The smallest prime factor of the first composite numerator of a Bernoulli number.
The smallest prime number less than the sum of cubic roots of all primes up to himself. [Gallardo]
The largest non-titanic prime that can be expressed as the sum of two consecutive numbers to their own powers, i.e., n^n + (n+1)^(n+1), (n=3). [Patterson]
283 is the (2*8*3 + 2+8+3)th prime. Note that 283 is the
smallest such prime. [Firoozbakht]
The first number n > 3 for which ((10^4n)+1)/10001 is prime.
The smallest prime adjacent to any amicable number. [Loungrides]
The smallest base-4 pandigital prime: 283 (dec) = 10123
(There are 5 curios for this number that have not yet been approved by an editor.)