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 A086060 #3 Oct 01 2013 17:57:41
%S A086060 5,57,5713,571319,57131931,5713193143,571319314361,57131931436173,
%T A086060 57131931436173103,57131931436173103109,57131931436173103109139,
%U A086060 57131931436173103109139151,57131931436173103109139151181
%N A086060 Concatenation of the larger members of first n pairs of twin primes.
%C A086060 5713...20832089 is the only prime for n up to 10000.
%o A086060 (PARI) concattwpr(n) = { y=5; print1(5","); forprime(x=7,n, if(isprime(x-2), y=eval(concat(Str(y),Str(x))); print1(y",") ) ) }
%Y A086060 Cf. A086043, A086158.
%K A086060 nonn,base
%O A086060 3,1
%A A086060 _Cino Hilliard_, Sep 08 2003