The thing is i like to make a 6-bit DAC :
5K
10K
20K
40K
80k
160k
320k
That can be made from three nominals: 5k is 2x10k in parallel.
Then 20k in parallel ( it is 10k).
Then 20k.
Then 20k in series.
Then 160k in parallel.
Then 160k.
Then 160k in series.
So we'll need only three popular values: 10k, 20k and 160k. Some of them exist in E24, some in E48, some in E96, and all are in E192.