In this week's LOST Episode 5x04 The Little Prince we heard and saw the numbers again.
First Jack said that Sayid was knocked out for 42 hours, then we learned Kate's address was 42 Panorama Crest, and then Ben told Jack to meet him a 23rd dock in the marina.
Here is a screencap of Kate's Address:
(Click to Enlarge)
Source: The ODI