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Article

Jaroma, John H.
Triangular repunit-there is but 1. (English). Czechoslovak Mathematical Journal, vol. 60 (2010), issue 4, pp. 1075-1077
MSC: 11A63, 11A99 | MR 2738969 | Zbl 1224.11007
Keywords:
repunit; triangular number
Summary:
In this paper, we demonstrate that 1 is the only integer that is both triangular and a repunit.
References:
[1] Tattersall, J. J.: Elementary Number Theory in Nine Chapters, 2nd ed. Cambridge University Press, Cambridge (2005). MR 2156483 | Zbl 1071.11002
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