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 A115552 #9 Jul 15 2021 09:13:07 %S A115552 9,18,27,267,2667,26667,266667,2666667,26666667,266666667,2666666667, %T A115552 9063180828,9237472767,9411764706,9586056645,9760348584,9934640523, %U A115552 10108932462,10283224401,10457516340,10631808279,10806100218 %N A115552 Numbers k such that k^2 is the concatenation of two numbers 8*m and m. %e A115552 9^2 = 8_1. %Y A115552 Cf. A102567, A106497, A115527 - A115556. %K A115552 nonn,base %O A115552 1,1 %A A115552 _Giovanni Resta_, Jan 25 2006 %E A115552 Definition modified by _Georg Fischer_, Jul 26 2019