Finbarr Holland. Problem 11256. The American Mathematical Monthly, 113(9):848, 2006. [doi]
@article{Holland06, title = {Problem 11256}, author = {Finbarr Holland}, year = {2006}, url = {http://www.jstor.org/stable/27642074}, researchr = {https://researchr.org/publication/Holland06}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {113}, number = {9}, pages = {848}, }