@article{CMJ_2010_60_4_a15,
     author = {Jaroma, John H.},
     title = {Triangular repunit-there is but 1},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1075--1077},
     year = {2010},
     volume = {60},
     number = {4},
     mrnumber = {2738969},
     zbl = {1224.11007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2010_60_4_a15/}
}