何 + counter + か - Grammar Discussion

some
several
a few

Structure

  • + counter +
  • いく + counter +
  • いくつか = general counter for things

[The meaning of / いく + counter + is closer to ‘at least two, but perhaps more’ than ‘multiple’]

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What’s the difference between this construction and just using the prefix 数?

Like:

数年 vs 何年か

When do I use 何 and when do I use いく?