%I #11 Aug 04 2015 15:46:06
%S 21,91,169,485,1183,1247,2047,5551,11557,14111,15229,17767,19909,
%T 21667,23651,38503,47197,49141,53131,64907,70579,72581,90851,100711,
%U 109061,144433,146611,153553,157753,158237,163831,191959,204263,222529,223721
%N Strong pseudoprimes to base 22.
%H R. J. Mathar, <a href="/A020248/b020248.txt">Table of n, a(n) for n = 1..215</a>
%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>
%K nonn
%O 1,1
%A _David W. Wilson_