Re: sn 1.10 first line araññe viharantānaṃ, santānaṃ brahmacārinaṃ

> Why does viharati have ānaṃ at the end?

You may find useful the table from the Pali Dictionary by Kogen Mizuno:

http://dhamma.ru/paali/tables/palisufi.htm

where you can find, for example:

-ānaṃ (-īnaṃ, -ūnaṃ)

1. m. n. f. pl. dat. gen. buddhānaṃ, phalānaṃ, gāthānaṃ
2. m. sg. acc. rājānaṃ, attānaṃ, brahmānaṃ

Best wishes,

                    Dmytro