Representation of Numbers from 1 to 20000 in Terms of Palindromic Digits 1357-9-7531

During past years author worked with representations of numbers in terms of 1 to 9 and 9 to 1. These representations called as crazy representations, and are done from 1 to 200000. For details see the references. This work is little different. It brings crazy representations of numbers from 1 to 20000 in terms of palindromic digits of 1357-9-7531. For each number 9 digits, 1, 3, 5, 7, 9, 7, 5, 3, 1 are used. This we have done by the help of extra operations or functions, such as factorial, square-root.  Similar kind of work for the numbers from 1 to 1729 in terms of digits 1729271 see author's work (click here) and for the numbers 1-10000 in terms of 2022-2022 (click here).