13th root 13th root Extracting the 13th root of a number is a famous category for the mental calculation world records. The challenge consists of being given a large number (possibly over 100 digits) and asked to return the number that, when taken to the 13th power, equals the given number. For example, the 13th root of 8,192 is 2 and the 13th root of 96,889,010,407 is 7. Extracting the 13th root has certain properties. One is that the 13th root of a number is much smaller: a 13th root will have approximately 1/13th the number of digits. Thus, the 13th root
Bristol 401 with the then-unique door handle arrangement, is believed to give the 401 a drag coefficient of less than Cd 0.36 — competitive even by today's standards and remarkable for the time. The engine was the same 2-litre in-line six-cylinder petrol unit of the 400, but was upgraded through improved Solex carburettors to increase power by to , which improved the performance further beyond what was achieved by the aerodynamics. The suspension is independent at the front using a transverse leaf spring and wishbones and the rigid axle at the rear uses torsion bars. Steering is by rack and pinion. The