Your input of .69220062755 was probably generated by one the following functions or found in one of the given tables. Answers are given from shortest to longest description Mixed constants with 5 operations 6922006275553463 = 1/exp(1/E) Bases constants, Pi, e, sqrt(2), etc... 6922006275553463 = (1/E)^(1/E) 1/exp(Xn)=Xn+1 X1=exp(-1) n=168 6922006275553463 = 1/exp(Xn)=Xn+1 n=2 Mixed constants with 5 operations 6922006275553463 = exp(Pi)/exp(1/E)*exp(-Pi)