%I #11 Aug 04 2015 16:30:21
%S 121,133,259,365,703,1649,1891,3281,4921,5461,8401,8911,9809,9841,
%T 9881,10585,12403,13019,13073,13333,16531,18721,19345,21901,23521,
%U 26467,26599,29891,31621,35371,37969,44287,47197,48133,50171,52801,55537,55969,63139
%N Strong pseudoprimes to base 27.
%H R. J. Mathar, <a href="/A020253/b020253.txt">Table of n, a(n) for n = 1..286</a>
%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>
%K nonn
%O 1,1
%A _David W. Wilson_