%0 Journal Article %T On the frequency of partial quotients of regular continued fractions %A Ai-Hua Fan %A Lingmin Liao %A Ji-Hua Ma %J Mathematics %D 2009 %I arXiv %R 10.1017/S0305004109990235 %X We consider sets of real numbers in $[0,1)$ with prescribed frequencies of partial quotients in their regular continued fraction expansions. It is shown that the Hausdorff dimensions of these sets, always bounded from below by $1/2$, are given by a modified variational principle. %U http://arxiv.org/abs/0906.3283v1