How to make a function? _Num1_To_Num2($num, '0123456789ABCDEFGHIJK', 'abcdefghijklmnopqrstuvwxyz') I can convert using these functions _DecToNum, _NumToDec. But there is a limit to 9223372036854775807 to decimal numbers. There is an algorithm shift, but I did not understand. $dec = 250 $timer = TimerInit() $n = _ _DecToNum($dec, 'abcdefghijklmnopqrstuvwxyz') & ', R= ' & @extended & @CRLF & _ _DecToNum($dec, '0123456789ABCDEF') & ', R= ' & @extended & @CRLF &