The Summation of i (between 1 and 9)
is a pair of arm-warmers whose stripes conform to the formula.

Knit in the round with a thumb gusset, these arm-warmers are sized for larger hands. The circumference is 8”.

The amount used is less than 30 yards of each yarn. Much less.

I like pairing variegated with solid, but who knows what coolness you can come up with.

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