### 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 )
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 