About the Number 199 (one hundred ninety-nine)

This nBAB for the number 199 was the 199th nBAB.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   199 is a natural, whole, integer
   199 is odd
   199 proper divisors are: 1,
   199 is deficient (sum of divisors is 1)
   199 is unhappy
   199 is not a Harshad number
   199 is prime
   ...Sexy prime with 193
   ...Twin prime with 197
   ...OEIS:002145 (4n+3; n=49)
   ...Right-truncatable
   ...prime triplet {193, 197, 199}
   ...prime quadruplet {191, 193, 197, 199}
   199 in octal is 0307
   199 in hexadecimal is 0xc7
   199 in binary is 11000111 (is odious)
   199 nearest square numbers: -3...26 (196...225 [15])
   sqrt(199) = 14.1067
   ln(199) = 5.2933
   log(199) = 2.29885
   199 reciprocal is .00502512562814070351758793969849
   199! is 3.94329e+372
   199 is 63.3437 Pi years
   199 is 9 score and 19 years
   199 written as a Roman numeral is CXCIX

[Wikipedia.org] 199 is the "sum of three consecutive primes (61 + 67 + 71) as well as the sum of five consecutive primes (31 + 37 + 41 + 43 + 47)."

[Wikipedia.org] 199 is a permutable prime. A permutable prime is a "prime number, which, in a given base, can have its digits switched to any possible permutation and still spell a prime number."

OEIS.org::id:A003459

[WolframAlpha.com] 199 is a Lucas number.

OEIS.org::id:A000032


Creator: Gerald Thurman [gthurman@gmail.com]
Created: 21 June 2009

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