M000000278

$$\pi=12621778600\arctan\left(\frac{2}{10355370165}\right)-4365018708\arctan\left(\frac{1}{32863722478}\right)+14921040158\arctan\left(\frac{1}{42354792693}\right)+20637624054\arctan\left(\frac{2}{86479075199}\right)+1993293966\arctan\left(\frac{2}{112899039159}\right)-8798592338\arctan\left(\frac{1}{71617196968}\right)+13193091290\arctan\left(\frac{1}{78535779057}\right)-13557828534\arctan\left(\frac{1}{102428655030}\right)+9939054248\arctan\left(\frac{1}{197877956739}\right)-9680764036\arctan\left(\frac{1}{225891903693}\right)+11766561494\arctan\left(\frac{1}{283378114193}\right)-6453334162\arctan\left(\frac{1}{324363564309}\right)+10347120916\arctan\left(\frac{1}{469027618483}\right)+2998083138\arctan\left(\frac{1}{492806748932}\right)+1925900920\arctan\left(\frac{1}{821345641657}\right)+1745608104\arctan\left(\frac{1}{3737240479718}\right)-14921040158\arctan\left(\frac{1}{11830545643782}\right)+7814457342\arctan\left(\frac{1}{28148191112477}\right)+3319338608\arctan\left(\frac{1}{55707370528529}\right)+8241098802\arctan\left(\frac{1}{69971515635443}\right)-12601817848\arctan\left(\frac{1}{109805699900318}\right)+3959621036\arctan\left(\frac{1}{7474541196075273}\right)$$