If you enter numbers in Calc, it will displays these in the current radix notation, which we will cover in the next section. By default the radix mode is set to decimal notation (base 10). If you would like to enter a numbers with different base you have to press # and enter the number in the following form: <number_of_base>#number . Some examples:

Description Emacs Calc Base 10 Binary 2#11110101 245 Octal 8#27 23 Hexadecimal 16#FFFF 65535