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 A043509 #15 Nov 01 2022 15:39:02 %S A043509 5,15,25,35,45,50,51,52,53,54,56,57,58,59,65,75,85,95,105,115,125,135, %T A043509 145,150,151,152,153,154,156,157,158,159,165,175,185,195,205,215,225, %U A043509 235,245,250,251,252,253,254,256,257,258,259 %N A043509 Numbers having exactly one 5 in base 10. %H A043509 Enrique Pérez Herrero, <a href="/A043509/b043509.txt">Table of n, a(n) for n = 1..2000</a> %H A043509 <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>. %F A043509 a(n) ≍ n^k log n, with k = log 9/log 10 = 0.9542425... = A104139. - _Charles R Greathouse IV_, Nov 01 2022 %t A043509 Select[Range[9000],DigitCount[#,10,5]==1&] (* _Enrique Pérez Herrero_, Nov 29 2013 *) %Y A043509 Cf. A043489, A043493, A043497, A043501, A043505, A043513, A043517, A043521, A043525, A011535. %K A043509 nonn,base,easy %O A043509 1,1 %A A043509 _Clark Kimberling_