4114756domain: NAppears in sequencesApproximation of the 2-adic integer arctan(4) up to 2^n.at n=22A309756Approximation of the 2-adic integer arctan(4) up to 2^n.at n=23A309756Approximation of the 2-adic integer arctan(4) up to 2^n.at n=24A309756