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.
%I A115546 #9 Jul 15 2021 09:14:24 %S A115546 857143,1714286,857142857142857142857142857142857142857142857143, %T A115546 1714285714285714285714285714285714285714285714286 %N A115546 Numbers k such that k^2 is the concatenation of two numbers 6*m and m. %e A115546 857143^2 = 734694_122449. %Y A115546 Cf. A102567, A106497, A115527 - A115556. %K A115546 nonn,base %O A115546 1,1 %A A115546 _Giovanni Resta_, Jan 25 2006 %E A115546 Definition modified by _Georg Fischer_, Jul 26 2019