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 A145750 #3 Mar 31 2012 10:26:07 %S A145750 661,1061,1091,1181,1601,1811,1901,6011,6991,10061,10091,10861,11681, %T A145750 16001,16981,19001,19961,60601,60611,69001,106861,108161,108881, %U A145750 109891,110881,116881,116911,118081,118861,119101,119611,160861,161611,168601,169691 %N A145750 Primes which become emirps when rotated by 180 degrees on a digital clock display. %C A145750 The sequence contains all bemirps A048895. %C A145750 Subsequence of A057770. [_R. J. Mathar_, Apr 05 2009] %e A145750 1109 is a prime. After 2D rotation it is 6011, which is prime. However, 6011 is not an emirp because 1106 is not prime. So 1109 is not in the sequence. %K A145750 nonn,base %O A145750 1,1 %A A145750 _Lekraj Beedassy_, Apr 04 2009 %E A145750 1109 removed, 6011 inserted etc. by _R. J. Mathar_, Apr 05 2009