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 A144162 #13 Oct 18 2020 13:54:47
%S A144162 51,52,53,54,56,57,58,59,501,502,503,504,506,507,508,509,551,552,553,
%T A144162 554,556,557,558,559,5001,5002,5003,5004,5006,5007,5008,5009,5051,
%U A144162 5052,5053,5054,5056,5057,5058,5059,5501,5502,5503,5504,5506,5507,5508,5509,5551
%N A144162 Numbers with at least two digits in which all digits except the rightmost are 0 or 5 and the rightmost is neither 0 nor 5.
%C A144162 These are called f-type numbers, cf. A163396.
%H A144162 Harvey P. Dale, <a href="/A144162/b144162.txt">Table of n, a(n) for n = 1..1000</a>
%H A144162 <a href="/index/Ca#CARRYLESS">Index entries for sequences related to carryless arithmetic</a>
%t A144162 Flatten[Table[10#+r,{r,{1,2,3,4,6,7,8,9}}]&/@FromDigits/@(Join[{5},#]&/@ Flatten[ Table[Tuples[{0,5},f],{f,0,3}],1])] (* _Harvey P. Dale_, Oct 18 2020 *)
%Y A144162 Cf. A143712, A163396, A169984.
%K A144162 nonn,base
%O A144162 1,1
%A A144162 _David Applegate_, _Marc LeBrun_ and _N. J. A. Sloane_, Aug 24 2010