All of the content on NamePros that is tagged 1number.
I wrote an article with 7 possible reasons why 1-character domains might be interessting for investors and end-users. The title: Why the Big...
10 premium domains for sale in one lot including
(1 Number, 1 Letter, One dictionary word, Hack, Crypto)
Namecheap (5 domains):
Separate names with a comma.