Stitch patterns give multiples so you know how many to cast on if you want to make a certain number of repeats of the pattern and have it come out evenly. A multiple of 6 plus 5 would be any multiple of 6, plus 5 more stitches, so 6 x 2 + 5, or 6 x 3 + 5, etc.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog