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233 (number)

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Title: 233 (number)  
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Subject: List of prime numbers, 232 (number), 230 (number), Sophie Germain prime, Full reptend prime
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233 (number)

232 233 234
Cardinal two hundred thirty-three
Ordinal 233rd
(two hundred and thirty-third)
Factorization 233
Prime yes
Roman numeral CCXXXIII
Binary 111010012
Ternary 221223
Quaternary 32214
Quinary 14135
Senary 10256
Octal 3518
Duodecimal 17512
Hexadecimal E916
Vigesimal BD20
Base 36 6H36

233 is the natural number between 232 and 234.

233 is a prime number,[1] 233 is the international dialing code Ghana a Sophie Germain prime,[2] a Pillai prime,[3] and a Ramanujan prime.[4] It is a Fibonacci number,[5] one of the Fibonacci primes.[6]

There are exactly 233 maximal planar graphs with ten vertices,[7] and 233 connected topological spaces with four points.[8]

Informal Use

233 is usually referred by Chinese people as laugh out loud, which is a reference to the 233rd emoji of a famous Chinese forum. The number of 3's can be indefinitely extended (for example, 23333 would have the same or slightly stronger effect as 2333).

References

  1. ^ "Sloane's A000040 : The prime numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^ "Sloane's A005384 : Sophie Germain primes p: 2p+1 is also prime", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^ "Sloane's A063980 : Pillai primes", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  4. ^ "Sloane's A104272 : Ramanujan primes", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  5. ^ "Sloane's A000045 : Fibonacci numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  6. ^ "Sloane's A005478 : Prime Fibonacci numbers", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  7. ^ "Sloane's A000109 : Number of simplicial polyhedra with n nodes", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  8. ^ "Sloane's A001929 : Number of connected topologies on n labeled points", The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
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