@inproceedings{l.1962the, title={The diophantine equation 2^{$n$}=$x$^{2}+7}, author={L. J. Mordell}, url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20170108203427891136989}, booktitle={Arkiv for Matematik}, volume={4}, number={5}, pages={455-460}, year={1962}, }