Ranges
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<?php
$num = 15623;
$part_length = 1476;
$parts = $num / $part_length;
for ($i = 0; $i < $parts; $i++) {
$start = $i*$part_length;
$end = $start + $part_length;
$ranges[] = [$start+1, $end];
}
if ($num % $part_length) $ranges[count($ranges)-1][1] = $num;
foreach ($ranges as $range) {
echo "${range[0]}:${range[1]}\n";
}
Php
INFO