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 A034055 #24 Feb 16 2025 08:32:37 %S A034055 8,18,24,29,36,38,42,46,49,63,64,66,67,76,77,79,81,83,88,92,94,97,99, %T A034055 118,124,129,136,138,142,146,149,163,164,166,167,176,177,179,181,183, %U A034055 188,192,194,197,199,214,219,222,226,229,233,234,236,237,241,243,248 %N A034055 Numbers with multiplicative digital root value 8. %H A034055 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MultiplicativeDigitalRoot.html">Multiplicative Digital Root</a> %H A034055 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %t A034055 dr8Q[n_]:=NestWhile[Times@@IntegerDigits[#]&,n,#>9&]==8; Select[ Range[ 250],dr8Q] (* _Harvey P. Dale_, Jun 10 2011 *) %Y A034055 Cf. A031347. %Y A034055 Cf. A034048, A002275, A034049, A034050, A034051, A034052, A034053, A034054, A034055, A034056 (numbers having multiplicative digital roots 0-9). %K A034055 nonn,base,easy %O A034055 1,1 %A A034055 _Patrick De Geest_, Sep 15 1998