Cast on 210 (or a multiple of 4 +2 stitches) using your method of choice.
Rows 1-4: Knit across (Garter stitch)
Row 5: Knit 2, Purl 2 across (right side)
Row 6: Purl 2, Knit 2 across (wrong side)
Repeat rows 5 and 6 three more times (8 rows total)
Row 13: Purl across (RS)
Row 14: Purl across (WS)
Row 15: Knit across (RS)
Row 16: Purl across (WS)
Row 17: Knit across (RS)
Row 18: Knit across (WS)
Row 19: Knit 2, Purl 2 across (RS)
Row 20: Purl 2, Knit 2 across (WS)
Repeat rows 19 & 20 three more times (8 rows total)
Row 27-30: Knit across (Garter stitch)
Cast off.
If there are any mistakes please leave a comment and let me know!
*edit* I used Bernat Softee Chunky (#5 on the label) and size 10 circular needles. Gauge isn't really important as it's a scarf. If you want to use a thinner yarn with smaller needs you can cast on any number that is a multiple of 4, then add 2 (mult of 4 + 2)