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Triangular repunit – there is but 1. (English) Zbl 1224.11007

Summary: In this paper, we demonstrate that 1 is the only integer that is both triangular and a repunit.

MSC:

11A63 Radix representation; digital problems
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References:

[1] J. J. Tattersall: Elementary Number Theory in Nine Chapters, 2nd ed. Cambridge University Press, Cambridge, 2005.
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