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 A137147 #13 Apr 12 2024 09:51:27 %S A137147 76,87,766,887,7666,8887,9786,76587,76666,87576,759576,766666,869866, %T A137147 869867,886886,888587,988866,7666666,8766867,8885887,76587576, %U A137147 76666666,76789686,86998666,87565786,87685676,88766867,97759786,97957576,766666666,875765766,886885887,887579686,977699687 %N A137147 Numbers k such that k and k^2 use only the digits 5, 6, 7, 8 and 9. %C A137147 Generated with DrScheme. %H A137147 Jonathan Wellons, <a href="/A137147/b137147.txt">Table of n, a(n) for n = 1..183</a> %H A137147 J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived] %H A137147 <a href="/index/Sq#squares">OEIS Index to sequences related to squares</a>. %e A137147 989878759589576^2 = 979859958686597599779967859776. %Y A137147 Cf. A136808, A136809, ..., A137146 for other digit combinations. %Y A137147 Cf. A000290 (the squares); A027675, A058411, ..., A058474 (3-digit combinations). %Y A137147 Cf. A277959, A277960, A277961, A295005, ..., A295009 (squares with largest digit = 2, 3, 4, 5, ..., 9). %K A137147 base,nonn %O A137147 1,1 %A A137147 Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008