The smallest cyclic unit prime number is a simple Arabic numeral. And the following prime number 13 form a twin prime number. N, n+2, n+6, n+8 (1 1, 13, 17, 19) are all prime numbers. The next permutation appears in 10 1, 103, 107, 109. In the carry system based on numbers above 10,1is expressed as B. Because 99 = 1 1 × 9,1/99 = 0.010. -1 1 is the signer number. In numbers, except 1 and 1, if all numbers are1,then if the number of digits of this number is a multiple of 2 (for example, 1 1 is 4 digits,/kloc- Because they can all be divisible by 1 1. If every number is 1, then if the number is a multiple of 3 (for example,11is 3 digits, 1 1 1 is 6 digits, 6/kloc. Because they can all be divisible by11or 3. (where 1 1 1÷3=37, so 1 1 can be divisible by 3). 165438+ 10 month 1 1, because there are four 1, which is dubbed Singles' Day. 1 1 also stands for singles.