About the Number 23 (twenty-three)

Olympic champion Michael Phelps got caught smoking weed at the age of 23.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   23 is a natural, whole, integer
   23 is odd
   23 is deficient (sum of divisors is 1)
   23 is happy
   23 is not a Harshad number
   23 is prime
   ...Cousin prime with 19
   ...Safe prime with 11
   ...Sexy prime with 29
   ...Sexy prime with 17
   ...Sophie Germain prime with 47
   ...OEIS:002145 (4n+3; n=5)
   ...Left-truncatable
   ...Right-truncatable
   ...prime triplet {17, 19, 23}
   23 is undulating
   23 in octal is 027
   23 in hexadecimal is 0x17
   23 in binary is 10111 (is evil)
   23 nearest square numbers: -7...2 (16 [4]...25 [5])
   sqrt(23) = 4.79583
   ln(23) = 3.13549
   log(23) = 1.36173
   23 reciprocal is .04347826086956521739130434782608
   23! is 2.5852e+22
   23 is 7.32113 Pi years
   23 is 1 score and 3 years
   23 written as a Roman numeral is XXIII

[Wikipedia] 23! is 23 digits long.

[Wikipedia] The first six digits of Pi (3.14159) sum to 23.

[Wikipedia] Human sex cells have 23 chromosomes.


Creator: Gerald Thurman [gthurman@gmail.com]
Created: 03 February 2009

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