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Color-list-nth-type-input.scss

// ----
// libsass (v3.2.5)
// ----

$colors: #FF0097, 
          #A200FF,
          #00ABA9,
          #8CBF26,
          #1BA1E2,
          #E671B8,
          #F09609,
          #A05000;

@for $i from 1 through length($colors) {
    .count:nth-of-type(#{length($colors)}n + #{$i} ) {
        background-color: nth($colors, $i);
    }
}

Color-list-nth-type-output.css

.count:nth-of-type(8n + 1) {
  background-color: #FF0097;
}

.count:nth-of-type(8n + 2) {
  background-color: #A200FF;
}

.count:nth-of-type(8n + 3) {
  background-color: #00ABA9;
}

.count:nth-of-type(8n + 4) {
  background-color: #8CBF26;
}

.count:nth-of-type(8n + 5) {
  background-color: #1BA1E2;
}

.count:nth-of-type(8n + 6) {
  background-color: #E671B8;
}

.count:nth-of-type(8n + 7) {
  background-color: #F09609;
}

.count:nth-of-type(8n + 8) {
  background-color: #A05000;
}