I might be wrong (math skills are fuzzy), but wouldn't 46/16 give you 8 skid patches?

Also, FWIW, skid patches is kind of a silly way to choose your gear ratio. You should go with whatever is most practical for the kind of riding you'll be doing. I suppose if the majority of your riding is spent showing off your skidding skills to the ladies downtown, then go for 17 skid patches, but nine times out of ten, you should pick the ratio that is best for your style of riding (not stopping). If that results in too few skid patches, just take your wheel off every once in awhile and rotate it a few teeth forward. Am I the only person that flops their hub from time to time?