With the rapid development of China's socio-economic, economic statistical data and statistical information grow by geometric progression.
It initia1ly probes whether any natural number N can be used as a mumerical value of even order multiplier magic square to construct a multiplier magic square of non-geometric progression.
The E optotype on the chart had 3 limbs of equal length. A regular geometric progression of optotype sizes and distribution was employed to arrange 14 lines with 4 optotypes on each line.