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 A107275 #10 Nov 03 2013 17:02:53 %S A107275 10011001,10100101,10111101,10200501,10500201,10511201,10800801, %T A107275 11011011,11100111,11111111,11200511,11500211,11511211,11800811, %U A107275 15011021,15100121,15111121,15200521,15500221,15511221,15800821 %N A107275 Vertically symmetrical dates YYYYMMDD (metric convention) for years >=1000, considered as numbers, in increasing order which here is also the chronological order. %C A107275 A little over 30 years ago, almost all nations agreed (...) on the (adoption and) use of the "metric system". For example, April 7, 1975, is expressed as 1975 04 07 (R. K. Guy) %C A107275 This sequence has exactly 84 terms, ending with 85800828 (8580 August 28th). %e A107275 2 and 5 are taken as mirror images (as on calculator displays). a(1)=10011001 and a(10)=11111111 shared the property to present also two symmetrical halves. %Y A107275 Cf. A053701, A106605. %K A107275 base,easy,fini,nonn %O A107275 1,1 %A A107275 _Alexandre Wajnberg_, May 19 2005 %E A107275 Definition clarified by _Hieronymus Fischer_, Apr 01 2012