how to use the exp mode:
add/subtract the digits up to 9.99 using the buttons "+ Digit 1" or "-Digit 3"
add/subtract the exponent to change the orders of magnitude using the buttons that have "exp" in it
that's all bye :3
! EXPONENTIAL UPDATE !
an extra digit has been added and more exponent buttons
this means 25th perfect number is possible and faster to get
thank you :)