Geodesic
Triangular repunit-there is but 1
Czechoslovak Mathematical Journal, Tome 60 (2010) no. 4, pp. 1075-1077

Voir la notice de l'article provenant de la source Czech Digital Mathematics Library

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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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/