Very simple real-valued time-series dataset for RNN prototyping
You can take a look at some of these datasets in UCI:

https://archive.ics.uci.edu/ml/datasets.php?format=&amp;task=&amp;att=&amp;area=&amp;numAtt=10to100&amp;numIns=&amp;type=ts&amp;sort=attUp&amp;view=table

These are quite straight forward, although they might contain more columns that 4 or 5. But they are quite simple.

Or you can take a look at this:

https://www.kaggle.com/uciml/electric-power-consumption-data-set

This is also based on UCI data.

Overall you can take a look at datasets available on Kaggle, you can probably find something there.

https://www.kaggle.com/datasets

Hope this helps.