 Dyadic rational

For any given prime number formula_1, a p"-adic fraction or p"-adic rational is a rational number whose denominator, when the ratio is in minimal (coprime) terms, is a power of formula_1, i.e., a number of the form formula_3 where "a" is an integer and "b" is a natural number.These are precisely the numbers possessing a finite base-"p" positional numeral system expansion.