10, 11, 12, 13, 14, 15, 16, 17, 20, 22, 24, ___ , 100, 121, 10000

What's the missing number in this sequence?

The nth term of the sequence is given by the decimal number 16 written in base (17-n).

For the 12th term (missing term) note that 16 is expresssible as 31 in base 5.

Thus, the required missing term is 31.

*Edited on ***March 11, 2007, 12:28 pm**