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Strong pseudoprimes to base 28.
1

%I #11 Aug 04 2015 16:46:37

%S 9,27,361,529,785,1431,2041,4699,5149,8401,14981,17767,27133,28009,

%T 32551,33227,35443,38503,43213,68143,80137,81317,82513,96139,97567,

%U 97831,113521,123391,124501,133141,146507,146611,159259,187461,219781,220585

%N Strong pseudoprimes to base 28.

%H R. J. Mathar, <a href="/A020254/b020254.txt">Table of n, a(n) for n = 1..209</a>

%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>

%K nonn

%O 1,1

%A _David W. Wilson_