About the Number 11 (eleven)

MathBabbler allocated some time expanding the homepage for the nBABs collection. While doing this work he noticed that there were nBABs for the numbers zero through ten, but there wasn't an nBAB for the number eleven; therefore, this nBAB was created.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   11 is a natural, whole, integer
   11 is odd
   11 is unhappy
   11 is not a Harshad number
   11 is prime
   ...Cousin prime with 7
   ...Safe prime with 5
   ...Sexy prime with 17
   ...Sexy prime with 5
   ...Sophie Germain prime with 23
   ...Twin prime with 13
   ...OEIS:002145 (4n+3; n=3)
   ...Super
   ...Palindromic
   ...prime triplet {5, 7, 11}
   ...prime triplet {7, 11, 13}
   ...prime triplet {11, 13, 17}
   ...prime quadruplet {5, 7, 11, 13}
   ...prime quadruplet {11, 13, 17, 19}
   11 is undulating
   11 in octal is 013
   11 in hexadecimal is 0xb
   11 in binary is 1011 (is odious)
   11 nearest square numbers: -2...5 (9 [3]...16 [4])
   sqrt(11) = 3.31662
   ln(11) = 2.3979
   log(11) = 1.04139
   11 reciprocal is .09090909090909090909090909090909
   11! is 3.99168e+07
   11 is 3.50141 Pi years
   11 is 0 score and 11 years

11 written as a Roman numeral is XI.

11 = sqrt(121)

11 is the smallest two-digit prime number.

Apollo 11 was the first manned spacecraft to land on the Moon.

Terrorists attacked the U.S. homeland on 11 September 2001.

11:11 is used in numerology. Hmmm... I wonder if this nBAB will still exist at 11:11 on 11/11/11.

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 12 November 2008