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 A115536 #7 Jul 15 2021 09:17:02 %S A115536 160378,169812,179246,188680,198114,207548,216982,226416,235850, %T A115536 245284,254718,264152,273586,283020,292454,301888,311322,320756, %U A115536 330190,339624,349058,358492,367926,377360,386794,396228,405662 %N A115536 Numbers k such that the square of k is the concatenation of two numbers m and 4*m. %H A115536 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/NonRecursions.html">Non Recursions</a> %e A115536 160378^2 = 25721_102884. %Y A115536 Cf. A102567, A106497, A115527 - A115556. %K A115536 nonn,base %O A115536 1,1 %A A115536 _Giovanni Resta_, Jan 25 2006