18 = 9 + 9 and 81 = 9 x 9
18 = 5+8+3+2 and 183 = 5832
18 = 4 × 4 + 4 −√4 = (44 ÷ √4) − 4
186 = 26+56+56+56+76+76+96+96+106+146+176
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
18
18 = 9 + 9 and 81 = 9 x 9
18 = 5+8+3+2 and 183 = 5832
18 = 4 × 4 + 4 −√4 = (44 ÷ √4) − 4
186 = 26+56+56+56+76+76+96+96+106+146+176
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics