I ran into an issue the other day; I wanted to include the line-number offset in the filename of the files I was generating, unfortunately as soon as I hit a million lines the 'seq' numbers started to use scientific notation (i.e. rather than 1000000 seq output 1e+6) - unfortunately, this wasn't compatible with some of the downstream processing.
The 'seq' manpage seemed to claims that it accepts printf formatting arguments. So I tried running 'seq -f "%d" 0 10000 160000000' and 'seq -f "%i" 0 10000 160000000' but neither of these were recognised. It turns out that seq actually only recognises the printf style floating-point format... so to get it to work as desired you have to use "%.0f" instead:
> seq -f "%.0f" 1000000 1000000 10000000 1000000 2000000 3000000 4000000 5000000 6000000 7000000 8000000 9000000 10000000