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233 is an interesting Fibonacci prime. If divided by the Fibonacci number 144, it approximates the golden ratio. The smallest prime factor of 2^{29}  1. 2^{233}  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] Neil J. A. Sloane, editorinchief of the OnLine Encyclopedia of Integer Sequences, works at AT&T Shannon Laboratories in room C233. The only known multidigit Fibonacci prime whose digits are all Fibonacci primes. [Gupta] The only known Fibonacci prime whose sum of digits is a Fibonacci number. [Russo] "Pascal's Wager" appears in Pensées 233. 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 NightTime 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 prime in base 3 whose sum of digits is composite. The smallest magic constant of a 5by5 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 twentyfour 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] 233 is the sum of the squares of first four semiprimes. Note that its reversal is the sum of the squares of three consecutive even semiprimes: 332 = 6^2 + 10^2 + 14^2. [Silva] 2*3*5* ... *prime(233  1) = prime(233)  1 (mod prime(233)). Note that 233 is the smallest known prime with this property and there exist only one other known such prime. [Firoozbakht] The smallest Fibonacci prime whose index is a perfect number. [Pol] "The triangular theorem of eight and nonfiniteness 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 290Theorem, 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] If A=1, B=2, C=3..., Z=26 then 'A RIGHTTRUNCATABLE PRIME' is a righttruncatable prime. [Homewood] 233 divides 239*241*251*257 + 1. Can you find five larger consecutive primes p < q < r < s < t such that pqrst + 1? [Loungrides] The smallest primedigit prime that is the sum of three primedigit primes (3+7+223). [Loungrides] The only multidigit primedigit Fibonacci prime. [Loungrides] 233: (233, 239, 241, 251, 257) is the only case of five consecutive 3digit primes p < q < r < s < t, such that p divides q*r*s*t+1. Note that the sequence of primes 2, 3, 5, 7, 11 is the previous case with the same property. [Loungrides]
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