Digital root number is the number mod 11 (Ɛ), for example, 1972 is 1 + 9 + 7 + 2 = 19 = 17 which is 1 + 7 = 8, while in decimal the root of the same number (3110) is 5; and in base 16 a digital root of a number is the number mod 15 (0xF), for example, 0x7DF is 7 + 13 + 15 = 35 = 0x23 which is 2 + 3 = 5, while in decimal the root of the same number (2015) is 8. Digital roots form an important mechanic in the visual novel adventure
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