233 (number)

← 232 233 234 →
← 230 231 232 233 234 235 236 237 238 239 → List of numbers Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred thirty-three
Ordinal	233rd (two hundred thirty-third)
Factorization	prime
Prime	yes
Greek numeral	ΣΛΓ´
Roman numeral	CCXXXIII, ccxxxiii
Binary	111010012
Ternary	221223
Senary	10256
Octal	3518
Duodecimal	17512
Hexadecimal	E916

233 (two hundred [and] thirty-three) is the natural number following 232 and preceding 234.

Additionally:

• 233 is a prime number ^[1]
• 233 is 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]
• It is the hypotenuse of a primitive Pythagorean triple: 233² = 105² + 208².

References

1. Sloane, N. J. A. (ed.). "SequenceA000040(The prime numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
2. Sloane, N. J. A. (ed.). "SequenceA005384(Sophie Germain primes p: 2p+1 is also prime)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
3. Sloane, N. J. A. (ed.). "SequenceA063980(Pillai primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
4. Sloane, N. J. A. (ed.). "SequenceA104272(Ramanujan primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
5. Sloane, N. J. A. (ed.). "SequenceA000045(Fibonacci numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
6. Sloane, N. J. A. (ed.). "SequenceA005478(Prime Fibonacci numbers)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
7. Sloane, N. J. A. (ed.). "SequenceA000109(Number of simplicial polyhedra with n nodes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
8. Sloane, N. J. A. (ed.). "SequenceA001929(Number of connected topologies on n labeled points)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.