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 A031296 #13 Jan 20 2024 18:00:14 %S A031296 9,29,49,69,89,109,129,149,169,170,172,174,176,178,180,182,184,186, %T A031296 188,189,219,249,279,309,339,369,399,429,459,461,464,467,470,473,476, %U A031296 479,482,485,488,489,519,549,579,609,639,669,699 %N A031296 Position of n-th 9 in A007376. %C A031296 A007376(a(n)) = 9. %H A031296 Reinhard Zumkeller, <a href="/A031296/b031296.txt">Table of n, a(n) for n = 1..10000</a> %o A031296 (Haskell) %o A031296 import Data.List (elemIndices) %o A031296 a031296 n = a031296_list !! (n-1) %o A031296 a031296_list = map (+ 1) $ elemIndices 9 a007376_list %o A031296 -- _Reinhard Zumkeller_, Jul 28 2011 %Y A031296 Cf. A007376. %Y A031296 Cf. A193428; A031287, A031288, A031289, A031290, A031291, A031292, A031293, A031294, A031295. %K A031296 nonn,less,base %O A031296 1,1 %A A031296 _Clark Kimberling_