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 A167041 #12 Mar 15 2024 02:24:16 %S A167041 4,25,400,2500,40000,250000,2805625,4000000,25000000,36300625, %T A167041 43890625,221265625,280562500,400000000,2500000000,3630062500, %U A167041 4389062500,22126562500,28056250000,40000000000,250000000000,363006250000,438906250000,2212656250000,2805625000000 %N A167041 Squares that remain squares when prefixed with a 6. %C A167041 Numbers s of A000290 such that 6*10^A055642(s)+s is also in A000290. %H A167041 Chai Wah Wu, <a href="/A167041/b167041.txt">Table of n, a(n) for n = 1..1000</a> %e A167041 4 = 2^2 is a square, and if prefixed with 6 becomes the square 64 = 8^2. %K A167041 nonn,base %O A167041 1,1 %A A167041 _Claudio Meller_, Oct 27 2009 %E A167041 Keyword:base added by _R. J. Mathar_, Oct 28 2009 %E A167041 More terms from _Chai Wah Wu_, Sep 11 2014