base 17 is a positional numeral system with seventeen as its base. It uses 17 different digits for representing numbers. The digits for base 17 could be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, and g.

conversion table

base 17	duodecimal (base 12)	base 17	duodecimal (base 12)
1	≈ 1	b	≈ b
2	≈ 2	c	≈ 10
3	≈ 3	d	≈ 11
4	≈ 4	e	≈ 12
5	≈ 5	f	≈ 13
6	≈ 6	g	≈ 14
7	≈ 7	10	≈ 15
8	≈ 8	11	≈ 16
9	≈ 9	12	≈ 17
a	≈ a	13	≈ 18