83 (number)

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.^[1]
• a safe prime.^[2]
• a Chen prime.^[3]
• an Eisenstein prime with no imaginary part and real part of the form 3n − 1.
• a highly cototient number.^[4]
• the number of primes that are right-truncatable.^[5]
• 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) ^[6]
• An emoticon based on :3 with wide-open eyes.

References

1. ^ "Sloane's A005384 : Sophie Germain primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
2. ^ "Sloane's A005385 : Safe primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
3. ^ "Sloane's A109611 : Chen primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
4. ^ "Sloane's A100827 : Highly cototient numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
5. ^
6. ^ "Hate Number Symbols: 83 - From A Visual Database of Extremist Symbols, Logos and Tattoos". Archived from the original on 2007-09-11. Retrieved 2007-09-24.