Xin-Jie Sun. On Sums of Three Pentagonal Numbers. The American Mathematical Monthly, 123(2):189-191, 2016. [doi]
@article{Sun16-36, title = {On Sums of Three Pentagonal Numbers}, author = {Xin-Jie Sun}, year = {2016}, url = {https://www.tandfonline.com/doi/abs/10.4169/amer.math.monthly.123.2.189}, researchr = {https://researchr.org/publication/Sun16-36}, cites = {0}, citedby = {0}, journal = {The American Mathematical Monthly}, volume = {123}, number = {2}, pages = {189-191}, }