Question: ithrational numtheory package

Hi i wanted to see how this function is generated so i entered:

numtheory:-ithrational := proc(i::nonnegint)
   1   if i = 0 then
   2     return 0
       end if;
   3   return numtheory:-ithratB(i-1)/numtheory:-ithratB(i)
end proc

showstat(ithratb)  returns the error that this function is not in the number theory package, which is the complete opposite of what is implied by the above.

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