You should be looking for 6N with 4's in lucky combinations, such as 348 and 748, which means "wealthy for three lifetimes" and "wealthy for seven lifetimes," instead of chasing after meaningless random numbers.
I'm sure there are a few of these kicking around, but I can tell you with certainty that 248, 348, 648, 748, 848, and 948 in conjunction with 768 ("fortune all the way") have all been regged in their permutations (N48768 and 768N48).
I have some, but someone faster on the trigger snagged 348768 (Chinese registrant), 768348 (Chinese registrant), 948768 (U.S. registrant), 848768 (Chinese registrant, no surprise), and 768848 (Chinese registrant, no surprise).
As far as I can tell 048 and 148 are not meaningful (I may be wrong), and 448 and 548 are considered unlucky.
Note: 048, 148, 448, and 548 currently available (in .com): 148768, 768148, 768048, 768448, and 548768
(This pesky 448768 is not available and registered by a Chinese registrant -- I suspect that 448 "wealthy on death" is somewhat mitigated by the ending of 768 "fortune all the way," but I don't really know. On the other hand, it's a recent reg of 10/6/2015, but before my regs).
My personal favorites are 648768 and 768648 because of the repetition of 6 and 8, two VERY lucky numbers.
I'm no expert on Chinese numerology, but I can read; there is a lot of information out there, and one might do well to look beyond the lists with just individual numbers.
Combinations seem to an important piece of the puzzle.