Don't worry about it, it probably doesn't have to be that accurate, 330R (probably even higher) will probably do.
Those resistors you've selected don't have a high enough power rating, they'll blow.
It might not be possible anyway, when the bulb is off it will have a very low resistance, probably just a few Ohms, and it might look for a very low resistance before turning the lamp on, it's worth giving it a go though.
How are you powering the LEDs?
You'll need a bridge rectifier or diode in reverse paralle to protect them from the reverse mains voltage.