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(another Prime Pages' Curiosity)
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+ 243 is the first number of the form pq where p & q are a prime pair (i.e., where p & q are prime and q = p + 2). [Hunter]

+ 243 = 3^5 is the sum of three first palindromic primes: 11, 101 and 131. [Gallardo]

+ 243 plus the product of the 243rd Fibonacci number and the 243rd Lucas number is prime. This is the largest such number less than a thousand. [Opao]

+ Smallest odd prime to an odd prime power, which is a sum of distinct primorials: 243 = 4# + 3# + 1# + 0# = 210+30+2+1 = 3^5. [Post]

(There are 2 curios for this number that have not yet been approved by an editor.)




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