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 A134845 #12 Aug 17 2020 01:56:59 %S A134845 32,101,448,1001,10004,10001,100004,100001,1000004,1000001,10000004, %T A134845 10000001,100000004,100000001,1000000004,1000000001 %N A134845 Smallest number k not divisible by 10 such that k^2 contains exactly n zeros. %H A134845 J. Browkin, <a href="https://web.archive.org/web/20071220044826/http://www.impan.gov.pl/Kryptologia/GROEB1.pdf">Groebner basis</a>. %e A134845 a(1)=32 because 32 is smallest number whose square contains exactly one zero. %Y A134845 Cf. A134843, A134844, A134846. %K A134845 nonn,base %O A134845 1,1 %A A134845 _Artur Jasinski_, Nov 13 2007, Nov 16 2007 %E A134845 a(9)-a(16) from _Arkadiusz Wesolowski_, Jan 19 2013