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@ 2017-09-04T04:51:36Z

<?php

$input = 20;

$a = function ($n) {
    return 10 * floor($n  / 4);
};

$b = function ($n) {
    return 2 ** ($n  % 4);
};

$values = [];

for ($n = 0; $input >= $value = $a($n) + $b($n) ; ++$n) {
    $values[] = $value;
}

echo implode(' ', $values);

Output
Performance
VLD
References
Branches

floor: documentation ( source)
implode: documentation ( source)

preferences:dark modelive previewkey bindings

26.76 ms | 405 KiB | 5 Q