www.mikescher.com/www/statics/euler/Euler_Problem-021.php

<?php

return 
[
	'number'      => 21,
	'date'        => '2014-09-15',
	'title'       => 'Amicable numbers',
	'abbreviated' => true,
	'steps'       => 601124986,
	'time'        => 102399,
	'width'       => 400,
	'height'      => 33,
	'value'       => 31626,
];