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 A227407 #21 Dec 06 2015 22:47:00
%S A227407 10103,10111,10133,10139,10141,10151,10159,10163,10169,10177,10181,
%T A227407 10193,10211,10223,10243,10247,10253,10259,10267,10271,10273,10289,
%U A227407 10301,10303,10313,10321,10331,10333,10337,10343,10357,10369,10391,10399,10427,10429,10433
%N A227407 Prime numbers representing a date in "condensed European notation" DDMMYY.
%C A227407 For February, the number of days will be 28 only, as the year cannot be a leap year if DDMMYY is to be a prime number.
%C A227407 The sequence is finite, with 3111 terms. The largest term is a(3111)=311299.
%H A227407 Shyam Sunder Gupta, <a href="/A227407/b227407.txt">Table of n, a(n) for n = 1..3111</a>
%e A227407 a(1)=10103 is prime and represents a date in DDMMYY format as 010103.
%t A227407 t = {}; Do[If[m < 8, If[OddQ[m], b = 31, If[m == 2, b = 28, b = 30]],If[OddQ[m], b = 30, b = 31]];Do[a = 100 m + y + 10000 d;If[PrimeQ[a], AppendTo[t, a]], {d, 1, b}], {m, 1, 12}, {y, 1, 99}]; Union[t]
%Y A227407 Cf. A213182, A227409.
%K A227407 nonn,base,fini,full,less
%O A227407 1,1
%A A227407 _Shyam Sunder Gupta_, Sep 22 2013