83 (eighty-three) is the natural number following 82 and preceding 84.
In mathematics
83 is:
- the sum of three consecutive primes (23 + 29 + 31).
- the sum of five consecutive primes (11 + 13 + 17 + 19 + 23).
- the 23rd prime number, following 79 (of which it is also a cousin prime) and preceding 89.
- a Sophie Germain prime.
- a safe prime.
- a Chen prime.
- an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
- a highly cototient number.
- the number of primes that are right-truncatable.
- a super-prime, because 23 is prime.
In other fields
- The eighth letter of the alphabet is H and the third letter is C, thus 83 stands for "Heil Christ," a greeting used by organizations that consider themselves to be Christian (While not necessarily a hate symbol, it is often used by hate organizations)
- An emoticon based on :3 with wide-open eyes.