A145750 - OEIS

%I #3 Mar 31 2012 10:26:07

%S 661,1061,1091,1181,1601,1811,1901,6011,6991,10061,10091,10861,11681,

%T 16001,16981,19001,19961,60601,60611,69001,106861,108161,108881,

%U 109891,110881,116881,116911,118081,118861,119101,119611,160861,161611,168601,169691

%N Primes which become emirps when rotated by 180 degrees on a digital clock display.

%C The sequence contains all bemirps A048895.

%C Subsequence of A057770. [_R. J. Mathar_, Apr 05 2009]

%e 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 nonn,base

%O 1,1

%A _Lekraj Beedassy_, Apr 04 2009

%E 1109 removed, 6011 inserted etc. by _R. J. Mathar_, Apr 05 2009