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 A107276 #13 Feb 11 2015 04:12:11
%S A107276 101101,111111,121151,151121,181181,201105,211115,221155,251125,281185
%N A107276 Vertically symmetrical dates DDMMYY ("condensed European notation") considered as numbers, in increasing order.
%C A107276 2 and 5 are taken as mirror images (as on calculator displays). From now on, the next symmetric date is November 20 2005 (201105). a(1)=101101, a(2)=111111 and a(5)=181181 share the property to present also two symmetrical halves. Next one is November 11 2011 (11 11 11).
%C A107276 Next one is Nov 21 2015 (211115). - _M. F. Hasler_, Feb 27 2013
%o A107276 (PARI) A107276(n)=101101+[8008,0,1001,2005,5002][n%5+1]*10+n\6*100004 \\ _M. F. Hasler_, Feb 28 2013
%Y A107276 Cf. A053701, A106605.
%K A107276 base,easy,fini,full,nonn
%O A107276 1,1
%A A107276 _Alexandre Wajnberg_, May 19 2005
%E A107276 Edited by _Jon E. Schoenfield_, Feb 10 2015