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<?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);
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