Question

How to calculate the series 1 2 3 6 9 18 27 54 81 162 243 ... N in PHP

Answer 1

// 1 2 3 6 9 18 27 54 81 162 243 ... N 
    
// (1) (2) 1 * 3 (3) 2 * 3 (6) : 3 * 3 (9) 6 * 3 (18) :
// 9 * 3 (27) 18 * 3 (54) : 27 * 3 (81) 54 * 3 (162) :
// 81 * 3 (243)

$a = 1;
$b = 2;
$total = 11;

echo $a . " " . $b . " ";

for ($i = 3; $i <= $total; $i++) {
    if ($i % 2 == 1) {
        $a = $a * 3;
        echo $a . " ";
    }
    else {
        $b = $b * 3;
        echo $b . " ";
    }
}




/*
run:

1 2 3 6 9 18 27 54 81 162 243 

*/

 

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