(x)10^{2d}+(1/2)10^{2d}+(2x+1). But 6x+4=10^d. So the right sides are
(x+0.5)(6x+4)^2+(2x+1).
(x)10^{2d}+(1/2)10^{2d}+(2x+1). But 6x+4=10^d. So the right sides are
(x+0.5)(6x+4)^2+(2x+1).
X^3+(2x+3)^3+(3x+2)^3. Also, for the x we are using (x=1, 16, 166, etc), 6x+4 is a power of 10, and therefore, so is (6x+4)^2.
X^3+(2x+3)^3+(3x+2)^3. Also, for the x we are using (x=1, 16, 166, etc), 6x+4 is a power of 10, and therefore, so is (6x+4)^2.