<?php
function canBeExpressedByAPairOfCubes($n) {
    $f = 0;
    for ($i = 1; $i < pow($n, 1 / 3); $i++)
        $a[$i] = pow($i, 3);
    foreach ($a as $b)
        foreach ($a as $c)
            if ($b + $c == $n)
                $f+=0.5;
    if ($f > 1)
        echo "$n has {$f} pairs found \n";
}
for ($i = 1; $i < 2000; $i++) canBeExpressedByAPairOfCubes($i);