### Eleventy-One

Eleventy-One, 111 or One hundred and eleven as it is more commonly (and more boringly) known is a number created by J. R. R. Tolkien in The Lord of the Rings. 111 is also known as one-eleven, as in the European Unions reciprocial health care agreement, the E111. This has nothing at all to do with the reciprocal of 111, which is 1/111, or
```  . .
0.009
```
Of course, to really confuse people, write it as 111-1, since most people don't know that x-1 means the reciprocal of x.

#### Interesting Maths (a contradiction in terms)

111/111 11/11 1/1 is 1 1 1 is eleventy one
Eleventy One has eleven letters.
1112 is 12321.
111 - 42 is a sex act.
111 is not prime: 37 x 3 = 111
The devils number has 111 as a factor
111 x 910 gives 101010 : the binary for 42
111 is approximately equal to 42 (an error of only 62.1% - good for a physics experiment)
111 has a nice binary representation: 1101111. As does 42 (101010). If 42 is uncertain (yes, no, yes, no, yes, no) then 111 is almost certain (well... 6/7 of the time!)
Originally posted: http://www.h2g2.com/A185627