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 A018833 #15 Apr 05 2024 08:19:50 %S A018833 0,1,9,32,43,81,287,706,729,4170,6561,30433,37530,38669,42783,59049, %T A018833 99543,192211,281782,394981,415578,531441,561785,666112,1723076, %U A018833 2046242,3039924,3485488,4782969,8684182,11512384,12684634,18346925,19988197,29728486,31190295 %N A018833 Numbers n such that n is a substring of its square in base 9 (written in base 10). %t A018833 Select[Range[0, 10^7], StringContainsQ[IntegerString[#^2, 9], IntegerString[#, 9]] &] (* _Paolo Xausa_, Apr 05 2024 *) %Y A018833 Cf. A018826 (base 2), A018827 (base 3), A018828 (base 4), A018829 (base 5), A018830 (base 6), A018831 (base 7), A018832 (base 8), A018834 (base 10). %K A018833 nonn,base %O A018833 1,3 %A A018833 _David W. Wilson_ %E A018833 a(35)-a(36) from _Pontus von Brömssen_, Apr 04 2024