101 is good and 88 is lucky number for prosperity and money
Paires are good like 2200 etc
Unlucky numbers are 13, 4 and 5 .
In East Asia, some buildings do not have a 4th floor
5 is associated with negative connotation, 55 unhappiness.
Only .com, .cc, .cn are valuable for this kind of domains , the shorter the better.