If you are looking for a cleaner, maybe I can help

SELECT * FROM gallery2 WHERE topic_id="523370" UNION SELECT * FROM gallery2 WHERE topic_id="305381" UNION SELECT * FROM gallery2 WHERE topic_id="1390705" UNION SELECT * FROM gallery2 WHERE topic_id="1389842" UNION SELECT * FROM gallery2 WHERE topic_id="511720" UNION SELECT * FROM gallery2 WHERE topic_id="529569" UNION SELECT * FROM gallery2 WHERE topic_id="291518" UNION SELECT * FROM gallery2 WHERE topic_id="1348542" UNION SELECT * FROM gallery2 WHERE topic_id="730722" UNION SELECT * FROM gallery2 WHERE topic_id="62986" UNION SELECT * FROM gallery2 WHERE topic_id="952719" UNION SELECT * FROM gallery2 WHERE topic_id="614260" UNION SELECT * FROM gallery2 WHERE topic_id="1722988" UNION SELECT * FROM gallery2 WHERE topic_id="999456" UNION SELECT * FROM gallery2 WHERE topic_id="535282" UNION SELECT * FROM gallery2 WHERE topic_id="1729822"