www.mikescher.com/www/statics/euler/Euler_Problem-051.php

<?php

return 
[
	'number'      => 51,
	'date'        => '2015-01-17',
	'title'       => 'Prime digit replacements',
	'abbreviated' => false,
	'steps'       => 802550671,
	'time'        => 113896,
	'width'       => 78,
	'height'      => 20,
	'value'       => 121313,
];