Mike F and David Hunter (screen names) replied correctly -- the bulb is an 1156, i.e. a single-filament, 25 Watt bulb. If you've got a yellow lens, you can use a clear bulb to maximize brightness; if you've got a clear lens, you'll need an amber bulb (1156A). However, unless I misunderstand your statement, it may not be your bulb....
re: "...The right turn signal is blinking quickly...."
You remarked that your bulb is blinking quickly. Does that mean that your bulb is lighting up? Then the bulb isn't necessarily bad.... (only very rarely is a bulb "near death" with an almost burned-out filament -- usually, it's either good or dead).
A fast blinking bulb usually indicates that a bulb is out, not the one that's blinking fast, but the other one (i.e., front vs. rear) that isn't blinking! Almost all flasher module are thermal type, and blink faster with fewer filaments being driven.
So have you looked at the light at the other end of the car -- is it working at all? If not, that's the reason for your fast blinking, and that's the bulb that needs to be replaced!
There is one other possibility for the fast blinking rate, especially if both front and rear bulbs seem to work, although it's unusual. Sometimes a socket (and this could be for your front or your rear bulb's socket, because they're in parallel) becomes poorly grounded -- then, the flasher will also blink fast.
In this rare situation, almost always only one side (i.e., left vs right) will blink fast -- the other side will blink at the normal rate -- and this effect will confirm that the problem is an electrical connection on the affected (fast) side.
Let us know if this helps.
Good luck, and best regards,
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