M000000266

$$\pi=12621778600\arctan\left(\frac{2}{10355370165}\right)+10081602604\arctan\left(\frac{2}{86479075199}\right)+8184296708\arctan\left(\frac{2}{112899039159}\right)+21112042900\arctan\left(\frac{1}{65815220307}\right)+1757429112\arctan\left(\frac{1}{71617196968}\right)+2637069840\arctan\left(\frac{1}{78535779057}\right)-3001807084\arctan\left(\frac{1}{102428655030}\right)+9939054248\arctan\left(\frac{1}{197877956739}\right)-950726620\arctan\left(\frac{1}{225891903693}\right)+4365018708\arctan\left(\frac{2}{520629831511}\right)-3154478664\arctan\left(\frac{1}{283378114193}\right)-12644336904\arctan\left(\frac{1}{324363564309}\right)-7557938312\arctan\left(\frac{1}{492806748932}\right)-10764921984\arctan\left(\frac{2}{1057852873951}\right)-2439117788\arctan\left(\frac{1}{821345641657}\right)+7727710312\arctan\left(\frac{1}{3737240479718}\right)+1623454600\arctan\left(\frac{1}{28148191112477}\right)-5982102208\arctan\left(\frac{2}{76154600377261}\right)+3319338608\arctan\left(\frac{1}{55707370528529}\right)+14432101544\arctan\left(\frac{1}{69971515635443}\right)-12601817848\arctan\left(\frac{1}{109805699900318}\right)+14306741952\arctan\left(\frac{1}{7474541196075273}\right)$$