Is it possible to express the number 21 through numbers 1, 5, 6 and 7 and any of the operations +, -, * and /? You don't get the answer? The Expressionist can help!

You can choose to have the numbers and operators permuted or combined independently. Take for example the sets 1,5,6,7 and +,-,*,/. Typical cases of expressions are listed in the following table.

Cases	permuted operators	combined operators
permuted numbers	5/1+6*7	1+5+6+7
combined numbers	1/1+1-1	1+1+1+1

The computation of all expressions can become quite lengthy, in part because the display of thousands of lines is time consuming. The expressionist lets you therefore filter the results and displays only those expressions matching a specific number.

Have fun!