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
Primitive root modulo n column is a primitive root modulo that number. The columns are labelled with the primes less than 100. The entry in row "p", column "q" is the index of "q" modulo "p" for the given root. For example, in row 11, 2 is given as the primitive root, and in column 5 the entry is 4. This means that 2 = 16 ≡ 5 (mod 11). For the index of a composite number, add the indices of its prime factors.For example, in row 11, the index of 6 is the sum of the indices for 2 and 3: . The