The smallest prime formed from the concatenated factors of a repunit (3 * 37).
337 = 2^(2^3) + 3^(2^2). [Kulsha]
813 + 1623 = 97. Note the exponents. [Rubin]
The canvas of the famous painting 'The Night Watch' by Rembrandt van Rijn, weighs 337 kilograms. [Bakker]
The sum of the areas of the rectangles in this Fibonacci paradox: if we divide a 13-by-13 square into four pieces as shown below, they can apparantly be rearranged into the one unit smaller 8-by-21 rectangle.
3!3! -/+ 7 form consecutive primes. [Beedassy]
The smallest emirp which when prefixed to the smallest pandigital string forms another emirp: 3370123456789. [Beedassy]
"Show that J_3 = 3 Pi Zeta(3) and hence that there are, on average, about 337 neutrinos, left over from the Big Bang, in each cubic centimetre of your Universe." Reference: David Broadhurst, Feynman's sunshine numbers. [Post]
Constantine I died in the year 337, after ruling for 31 years. He was the first of 11 Emperors named Constantine to rule the Byzantines. Note that 11, 31, 337, and their reversals are all primes!
A penguin known as No. 337 scaled a rock wall and escaped from the Tokyo Aquarium. [Reuters]
(There are 11 curios for this number that have not yet been approved by an editor.)