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 A222620 #6 Feb 26 2013 14:56:12 %S A222620 0,1,2,3,4,5,6,7,8,9,11,22,33,44,55,101,111,121,131,141,151,202,212, %T A222620 222,232,242,252,303,313,323,333,343,353,404,414,424,434,444,454,505, %U A222620 515,525,535,545,555,606,616,626,636,646,656,707,717,727,737,747,757 %N A222620 Palindromic time display in hours, minutes, seconds on a six spaced 24-hour digital clock. %C A222620 Leading zeros are ignored, so the term a(3) = 2, for example, corresponds to the display 00:00:02. Sequence has 699 entries. Greatest leap occurs between the successive terms a(675) = 155551 and a(676) = 200002; that is, between 15h55m51s and 20h00m02s. %H A222620 Nathaniel Johnston, <a href="/A222620/b222620.txt">Table of n, a(n) for n = 1..699</a> (full sequence) %Y A222620 Cf. A082567. %K A222620 nonn,fini,full,base %O A222620 1,3 %A A222620 _Nathaniel Johnston_, Feb 26 2013