Question

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains same digits only.

Can you find that number ?

Answer 1

142857*1=142857
142857*2=285714
142857*3=428571
142857*4=571428
142857*5=714285
142857*6=857142

so the answer is "142857"