@for sass function issue

AHHHHHHH

$color_2: lighten(#026dbd, 45%)
$color_3: lighten(#fad52c, 20%)
$color_4: lighten(#f17d32, 20%)
$color_5: lighten(#da1c1c, 25%)
$color_6: lighten(#8266ba, 20%)
$color_7: lighten(#7bb545, 17%)
  
@for $i from 2 through 7
  &:nth-child(#{$i})
    background-color: $color_#{$i}

you can also write a list and make it one variable.

$color: lighten(#026dbd, 45%), lighten(#fad52c, 20%), lighten(#f17d32, 20%), lighten(#f17d32, 20%), lighten(#da1c1c, 25%), lighten(#8266ba, 20%), lighten(#7bb545, 17%)

@for $i from 2 through 7
  &:nth-child(#{$i})
    background-color: nth($color, $i)

Scott, this revision is brilliant, thank you.