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 A107309 #10 Sep 13 2015 23:26:09
%S A107309 53,75,1311,1917,3129,4341,6159,7371,103101,109107,139137,151149,
%T A107309 181179,193191,199197,229227,241239,271269,283281,313311,349347,
%U A107309 421419,433431,463461,523521,571569,601599,619617,643641,661659,811809,823821,829827,859857,883881,10211019,10331031,10511049,10631061,10931091,11531151
%N A107309 Concatenation of twin primes in reverse order.
%H A107309 Chris Caldwell, <a href="http://www.utm.edu/research/primes/lists/small/1ktwins.txt">The First 1,008 Twin Primes</a>.
%e A107309 The twin primes 41 and 43 are concatenated in reverse order to give 4341, which is the sixth term in the sequence.
%t A107309 f[{a_,b_}]:=FromDigits[Join[IntegerDigits[b],IntegerDigits[a]]]; f/@Select[Partition[Prime[Range[200]],2,1],#[[2]]-#[[1]]==2&] (* _Harvey P. Dale_, Jan 01 2011 *)
%Y A107309 Cf. A095958.
%K A107309 nonn,base,less
%O A107309 0,1
%A A107309 _Parthasarathy Nambi_, May 20 2005
%E A107309 More terms from _Harvey P. Dale_, Jan 01 2011