<?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);
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