How to obtain indexes from a sublist

how to obtain indexes from a sublist, 19-20-21-25 would be the result

Hi @Angel76 could a list.flatten work ?

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Do you want the values of the sublists or the index numbers that have value to be the result?

Perhaps List.Count, >, and List.AllIndiciesOf nodes?

if the values

I need the index values

I don’t think i understand… But here is something to keep the fire alive.