As of now,
tex.stackexchange.com/q/7032 is outdated: the standard
\textcircled{0} … \textcircled{9}
in Computer Modern are better than in the OP. Namely, running pdflatex on
pastebin.com/raw/fwY6wFz9 yields
i.imgur.com/nDZZ14q.png . Here, most circles don't touch the digits, whereas in the OP, all circles visibly touch the digits. Would anyone care to improve the question or mark it as (half-)obsolete?