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 A102497 #4 Feb 15 2011 12:26:18 %S A102497 112121,113131,115151,119191,127271,131311,134341,136361,140401, %T A102497 142421,145451,149491,157571,158581,161611,169691,170701,172721, %U A102497 178781,182821,187871,190901,191911,196961,197971,1100010001,1100210021,1101710171 %N A102497 Primes of the concatenated form 1nn1 where n is an integer >=0. %e A102497 112121 is prime and is of the form 1nn1 for n=12. %e A102497 1100010001 is prime and is of the form 1nn1 for n=1000. %Y A102497 Cf. A100846; A100496 for the values of n that produce these primes. %K A102497 easy,nonn,base %O A102497 1,1 %A A102497 Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 12 2005