Geodesic
Triangular repunit-there is but 1
Czechoslovak Mathematical Journal, Tome 60 (2010) no. 4, pp. 1075-1077 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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In this paper, we demonstrate that 1 is the only integer that is both triangular and a repunit.
In this paper, we demonstrate that 1 is the only integer that is both triangular and a repunit.
Classification : 11A63, 11A99
Keywords: repunit; triangular number 
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     author = {Jaroma, John H.},
     title = {Triangular repunit-there is but 1},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1075--1077},
     year = {2010},
     volume = {60},
     number = {4},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2010_60_4_a15/}
}
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Jaroma, John H. Triangular repunit-there is but 1. Czechoslovak Mathematical Journal, Tome 60 (2010) no. 4, pp. 1075-1077. http://geodesic.mathdoc.fr/item/CMJ_2010_60_4_a15/