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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
function isSequence3($num) {
if ($num < 123) return false;
$digits = str_split($num);
$seq = 1;
for($i=1; $i<count($digits); $i++) {
if ($digits[$i] == ($digits[$i - 1] + 1)) $seq++;
else $seq = 1;
}
return $seq > 2;
}
$sum = 0;
for ($n=1; $n<=10000; $n++) {
if (isSequence3($n)) $sum += $n;
}
printf("Sum: %d", $sum);