This number is a prime.
2233 - 3 is prime. [Kulsha]
Describing 233 and repeating the process with each new term produces five more primes, i.e., "one 2, two 3's," generates 1223, etc. [Rivera]
The only known Fibonacci prime whose sum of digits is a Fibonacci number. [Russo]
Had Ray Bradbury used the metric system, he may have called his novel "Celsius 233." [Hartley]
Claimed to be the first book with no verbs, The Train from Nowhere by Michel Thaler (a pseudonym) has 233 pages. [Opao]
233 is the final chapter of The Curious Incident of the Dog in the Night-Time by Mark Haddon, which uses all prime numbers for its chapters.
233+(2+3+3), 233+2*3*3, and 233+2^3*3 are consecutive primes. [Silva]
The smallest magic constant of a 5-by-5 prime magic square:
41 11 79 19 83 31 67 29 89 17 61 59 05 71 37 97 53 13 47 23 03 43 107 07 73Note that this solution includes all the twenty-four odd primes below hundred (Andrew Lelechenko, 2009). [Beedassy]
Jewel Cave in South Dakota contains 233 kilometers of mapped passageways. [Robinette]
The largest known Fibonacci prime with exactly two different digits. Note the first two primes. [Capelle]
"The triangular theorem of eight and non-finiteness results for quadratic polynomials" by Wieb Bosma and Ben Kane conjectures that the largest of all values in a sequence related to Universal Quadratic Forms, the representability of integers as sums of triangular numbers, and the 290-Theorem, is 233. [Post]
The larger of only two primes less than a googol formed by concatenating a number n followed by n 3's. The other is 13. [Loungrides]
The only multidigit prime-digit Fibonacci prime. [Loungrides]
The Woolworth Building is an early American skyscraper (once the world's tallest) located at 233 Broadway in Manhattan, New York City. [Gilbert]
The smallest prime and the only known prime-digit prime that can be represented as the sum of eleven consecutive primes, i.e., 5 + 7 + 11 + ... + 37 + 41. [Loungrides]
A potentially rocky planet, known as Barnard's star b, is a 'super-Earth' that orbits around its host star once every 233 days.
233 is the smallest number that can be written as the sum of 11 primes in 11 ways. Is there another prime which can be the the sum of p (prime) distinct primes in p ways? [Sariyar]