base 23 is a positional numeral system with twenty-three as its base. It uses 23 different digits for representing numbers. The digits for base 23 could be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f, g, h, i, j, k, l, and m.

conversion table

base 23	duodecimal (base 12)	base 23	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	h	≈ 15
8	≈ 8	i	≈ 16
9	≈ 9	j	≈ 17
a	≈ a	k	≈ 18