> 0x999999999999999 to decimal
>   0x999999999999999 = 6.91752903 × 10^17
> log(0x999999999999999)
>   log(0x999999999999999) = 17.839951
> Google Clacは便利だな

10進→16進もできる(;´Д`)SUGEEEEEEEEEEEEEEEEE

参考：2006/03/13(月)21時45分37秒