%I #11 Aug 04 2015 13:05:33
%S 21,65,231,265,689,703,1241,3445,4411,6973,8421,12871,15883,18721,
%T 20191,22261,24727,31417,42127,44801,60551,69841,79003,82513,83333,
%U 85609,92631,98671,113401,116941,133141,136741,159621,166499,190513,191407,220669
%N Strong pseudoprimes to base 83.
%H R. J. Mathar, <a href="/A020309/b020309.txt">Table of n, a(n) for n = 1..211</a>
%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>
%K nonn
%O 1,1
%A _David W. Wilson_