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 A053958 #18 Jul 16 2025 17:53:07
%S A053958 2,8,22,92,262,2978,258238,805262,9191762,81784378,696037692,
%T A053958 2546858238,93095030408,2620848420738,26204321529981784378
%N A053958 Numbers k such that k^2 contains only digits {4,6,8}.
%H A053958 Patrick De Geest, <a href="https://www.worldofnumbers.com/threedigits.htm">Squares containing at most three distinct digits, Index entries for related sequences</a>.
%H A053958 Hisanori Mishima, <a href="https://www.asahi-net.or.jp/~KC2H-MSM/mathland/math02/math0210.htm#468">Sporadic tridigital solutions</a>.
%H A053958 Author?, <a href="http://web.archive.org/web/20080708203024/http://blue.kakiko.com/mmrmmr/htm/eqtn06.html">Source</a>(<a href="http://web.archive.org/web/20060426155831/http://blue.kakiko.com/mmrmmr/txt/eqtn06.txt">txt</a>)
%Y A053958 Cf. A053959.
%K A053958 nonn,base,hard,more
%O A053958 1,1
%A A053958 _Patrick De Geest_, Mar 15 2000
%E A053958 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 03 2005
%E A053958 One more term from _Jon E. Schoenfield_, Sep 04 2006
%E A053958 a(15) from Mishima's website added by _Elmo R. Oliveira_, Jul 16 2025