Paul Pollack. An Easy Generalization of Euler's Theorem on the Series of Prime Reciprocals. The American Mathematical Monthly, 122(2):159-163, 2015. [doi]
@article{Pollack15,
title = {An Easy Generalization of Euler's Theorem on the Series of Prime Reciprocals},
author = {Paul Pollack},
year = {2015},
doi = {10.4169/amer.math.monthly.122.02.159},
url = {http://dx.doi.org/10.4169/amer.math.monthly.122.02.159},
researchr = {https://researchr.org/publication/Pollack15},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {122},
number = {2},
pages = {159-163},
}