These programs counterdick them self. Low + high = period = Hz. Trial and error 1 hour later nothing works. When period says 34 then Hz is .029 If period = Hz the 2 numbers have to be the same. No matter what I try HIGH is never less than 3 second and LOW is never less than 6 seconds. Circuit drawing is wrong we need the circuit with the 2 diodes. Even with one resistor at 0 ohms it still does not work. Book say, R1+R2 never less than 1000 ohms, never more than 3.3M ohms.
A different program someone listed shows R1=50 ohm R2=950 ohm works but do the math or put those number in a different online program they do not work.