A115545 Numbers k such that the concatenation of 6*k with k gives a square.
122449, 489796, 122448979591836734693877551020408163265306122449, 489795918367346938775510204081632653061224489796
Offset: 1
Examples
734694_122449 = 857143^2.
This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
734694_122449 = 857143^2.