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 A031294 #11 Jul 13 2013 12:01:55 %S A031294 7,25,45,65,85,105,125,130,132,134,136,138,140,142,144,145,146,148, %T A031294 165,185,213,243,273,303,333,363,393,401,404,407,410,413,416,419,422, %U A031294 423,425,428,453,483,513,543,573,603,633,663,693 %N A031294 Position of n-th 7 in A007376. %C A031294 A007376(a(n)) = 7. %H A031294 Reinhard Zumkeller, <a href="/A031294/b031294.txt">Table of n, a(n) for n = 1..10000</a> %o A031294 (Haskell) %o A031294 import Data.List (elemIndices) %o A031294 a031294 n = a031294_list !! (n-1) %o A031294 a031294_list = map (+ 1) $ elemIndices 7 a007376_list %o A031294 -- _Reinhard Zumkeller_, Jul 28 2011 %Y A031294 Cf. A193428; A031287, A031288, A031289, A031290, A031291, A031292, A031293, A031295, A031296. %K A031294 nonn,less,base %O A031294 1,1 %A A031294 _Clark Kimberling_