For real numbers, there’s the dictionary of real numbers (https://www.amazon.com/Dictionary-Real-Numbers-Jonathan-Borw...), “a list of just over 100,000 eight-digit real numbers in the interval [0,1) that arise as the first eight digits of special values of familiar functions”
Its online equivalent is the inverse symbolic calculator (https://en.wikipedia.org/wiki/Inverse_Symbolic_Calculator)