I’ve noticed that some suttas repeat in different nikayas. For example,
Selasutta which is #7 of Sutta Nipata’s Mahavaga book, is also in
Majjhima Nikaya as sutta 92.
Does anyone know of a list anywhere online that lists which suttas repeat and where?
I would love to see such a nerd-project! Also many SN and AN suttas are recycled in the MN, or AN suttas with lower numerals are recycled with minor additions in AN suttas with higher numerals etc.
If I had less to do I could totally imagine investing time in this. But maybe someone really did that already?
On the new site you can find all parallels to a sutta in the dropdown list either with the sutta itself or in the list (we call it suttaplex) with all the suttas.
For instance here: https://suttacentral.net/dn-silakkhandhavagga you can click on the dropdown next to the green badge with a number and then you get a list of all suttas and parts of suttas that are the same in other suttas.
You can also find indexes of subjects, names, similes and terminology: