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Strong pseudoprimes to base 81.
2

%I #11 Aug 06 2015 12:55:30

%S 91,121,511,671,703,949,1387,1541,1729,1891,2701,2821,3281,3367,3751,

%T 5551,6643,7381,8401,8695,8911,10585,11011,12403,12991,14383,15203,

%U 15251,15841,15863,16471,16531,18721,19345,23521,24661,24727,26335,28009,29341

%N Strong pseudoprimes to base 81.

%H R. J. Mathar, <a href="/A020307/b020307.txt">Table of n, a(n) for n = 1..300</a>

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

%K nonn

%O 1,1

%A _David W. Wilson_