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 A113591 #9 Sep 17 2024 19:34:48 %S A113591 0,4,6,8,9,40,48,84,60,48,90,40,84,44,48,400,468,486,84,60,64,66,68, %T A113591 490,468,494,468,40,84,44,90,46,48,49,400,408,468,486,440,448,684,406, %U A113591 60,496,6048,64,4680,66,68,69,490,648,444,600,608,4004,468,80,486,984,84 %N A113591 Least multiple of composite(n), containing only composite digits (0,4,6,8,9). %C A113591 The sequence A002808 is extended with A002808(0)=0 to define "composite" here. Every term occurs in A001744. - _R. J. Mathar_, Aug 28 2007 %F A113591 a(n) = A078240(A002808(n)) for n > 0. - _Andrew Howroyd_, Sep 17 2024 %e A113591 a(7) = 84, composite (7) =14, term corresponding to 14 is 84. %Y A113591 Cf. A002808, A078240, A113590. %K A113591 base,easy,nonn %O A113591 0,2 %A A113591 _Amarnath Murthy_, Nov 07 2005 %E A113591 Corrected and extended by _R. J. Mathar_, Aug 28 2007