\[\frac{1}{π}≈\frac{113}{355}=\frac{1}{x}+\frac{1}{y}+\frac{1}{z}+\frac{1}{w}\]有多组正整数解,如:
{{4,15,609,864780},{4,15,610,259860},{4,15,612,108630},{4,15,615,58220},{4,15,620,33015},{4,15,630,17892},{4,15,639,12780},{4,15,660,7810},{4,15,710,4260},{4,15,780,2769},{4,15,852,2130},{4,15,1065,1420},{4,16,176,7810},{4,20,55,7810},{4,22,44,7810},{5,9,140,17892},{5,9,142,6390},{5,10,55,7810}} |