@article{RUMI_2022_1_7_2_a2,
     author = {Zaccagnini, Alessandro},
     title = {$2021 = 43 \cdot 47$},
     journal = {Matematica, cultura e societ\`a},
     pages = {121--133},
     publisher = {mathdoc},
     volume = {Ser. 1, 7},
     number = {2},
     year = {2022},
     zbl = {1071.11070},
     mrnumber = {2123939},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/RUMI_2022_1_7_2_a2/}
}